Malicious PDF — malware analysis report

Static analysis result for SHA-256 d743f2e545f34cf3…

MALICIOUS

PDF

78.1 KB Created: 2021-06-01 01:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 488b93aacef70cb8b01d2b97e9ed1c06 SHA-1: 26c7e8d7ace700381f1f43c17acc3a26ca27eceb SHA-256: d743f2e545f34cf3c0c8d515ff26323462733766361d0cc1e1c9048b975ff13e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/pbw?utm_term=what+does+it+mean+when+it+says+service+stabilitrak PDF link annotation
    • https://wofigazidiw.weebly.com/uploads/1/3/1/4/131437722/e87e947e40399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446776/normal_5ff22d51bad06.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/867492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417122/normal_5fcf679f2f246.pdfIn PDF document text
    • https://xemuvexakono.weebly.com/uploads/1/3/4/6/134655393/4171e3c312e75.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://uploads.strikinglycdn.com/files/b093918a-1596-49aa-b901-ed4e27f04ba2/laccord_du_participe_pass_avec_lauxiliaire_avoir_exercices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19167b82-1847-42b7-96ec-a052b9231339/what_are_the_three_branches_of_government_and_what_does_checks__balances_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42adc59a-0cf7-4549-8f34-d87ac0943ab6/eyelash_extension_client_record_form.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144427578/wigemuj.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144423429/nigitazijabasom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63281c0b-86ca-4769-a39b-0381f48c6e4c/ab_lounge_sport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d7d837-6040-4095-bceb-1b3a864e5508/perry_chemical_engineers_handbook_r.h_perry_and_d._green.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148d160c-326e-4ca5-833e-e0c348218cbe/tewakodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094653bd-8ec3-4a87-8425-7e9132363fe5/vonixisoraborilojusig.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/castle_defense_2_mod_apk_revdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a64263-0ca2-43f3-85b6-ec820c59e45a/mazitixedosikupop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7cb5b0-ba4b-4fb8-8324-6e5be240a40f/how_to_troubleshoot_water_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ab5cc1-ba8e-4f88-ad7c-532cd6314f6b/26756176207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1039fcc6-696b-4f95-a22d-d2a8316e34dd/92117865516.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/need_for_speed_payback_ps4_mod_menu.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/42056098039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a50de1-e172-4d62-aa0a-cae86b9a63a2/sufaporurimujagadutolusiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9e52aa-c94e-4f41-a3ac-3efffa0cb7c9/the_strength_training_anatomy_workout_v2.0.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 5436 bytes
SHA-256: 6e554ce7fc6084406f74dbdb77beeb2f644ac30e9f1f5e865598112353bbd08e
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 10632 bytes
SHA-256: 1bcd8b8a6b18fabea8f8cfcdf2011ee3cfb3cc14ca31f15fead81fa445b9bb8c
font_02_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f