Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d3a6430a470c79…

MALICIOUS

PDF

91.6 KB Created: 2021-03-28 08:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ecee09922ad973c2afc675a9acf4633f SHA-1: 14ebedc4e51453ad609008494024ea8d8d8d0dd3 SHA-256: a1d3a6430a470c797d86d67d09312572607307cc5dce78b26cd0ccb8767b9eab
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam campaign. The document's content is obfuscated, but the presence of external URIs and the ML classifier's high confidence score suggest malicious intent. The ClamAV detection further supports this, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/wix?keyword=law+and+order+svu+repression+recap PDF link annotation
    • https://cdn.sqhk.co/jivonaxadu/Ihc41Yn/tufar.pdfIn PDF document text
    • http://iuts.space/buripezuwepudogasusd9wbf.pdfIn PDF document text
    • http://yozi.store/braun_thermoscan_5_with_exactemp_instructionseilz7.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/hajieif/hockey_quiz_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/dhdigBm/81807654502.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/MhiXyhe/draw_your_game_apk_mod.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/college_bonafide_certificate_form.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/FibgjeY/dynalist_vs_workflowy_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/xgijchd/fulumutetu.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/12408103751.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/07nki45/23231286984.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/ieLjAhi/international_kangaroo_linguistic_contest_2018_answer_key.pdfIn PDF document text
    • http://axecheat9.xyz/last_of_us_theme_violin_sheet_musicy0gvq.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/hjashjP/rasegeditutaxumudivu.pdfIn PDF document text
    • https://cdn.sqhk.co/janogoxuke/QUrhgii/short_film_prompts.pdfIn PDF document text
    • http://honbiz.pro/tom_sawyer_book_onlined5z09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_7e9ee1afc94c4ed5bc0396881ba4d813.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6beccfe-d2b1-4297-b0ec-8cca10106299/micro_usb_charging_cable_wiring_diagram.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_a2e0facfb10a44fa93152a71a972e063.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_783881a51e8b4388bf691f59065ce852.pdf?index=trueIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_14dcc05b8b07497c8e474897f62d37c2.pdf?index=trueIn PDF document text
    • http://vawirir.atwebpages.com/academische_vaardigheden_voor_interdisciplinaire_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96aefc7d-19ad-4fd8-83bc-3df972fcb78b/11826186548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b7e6b3-3a95-4a34-93c6-4c2192721b3d/47850050410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6ac8f5-543e-4463-aa58-41e9437d4eb3/how_to_use_architectural_scale.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_f7d51a4dcb2d431fb5f91f4074821ca0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 4932 bytes
SHA-256: 970a2cd19a6e40abd0de99a1ac188576cb55c2161080ffbac34d3ef64bb5fd33
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 4236 bytes
SHA-256: 932ca54bb5d36db6606a066cb609d30d3a8b2774bb97a55573285a33aea503ce
font_02_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 11928 bytes
SHA-256: 740717c3a0455977d134c4c276f8aea350a41b2f1a4f0180d65bc20ba1bac1b8
font_03_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 16752 bytes
SHA-256: 702db90d42636ecfbb1414188bfcce8466f506840e16ce24213d65cd16988d67
font_04_sfnt_off000151e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

Open this report in the interactive analyzer, or submit your own file for analysis.