Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5810dce1d3fee3f…

MALICIOUS

PDF

86.0 KB Created: 2021-03-29 22:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd77cb3de5be856148633e75f8c76be2 SHA-1: 8867249b42d4db93ffa5128d4523991d302eea30 SHA-256: c5810dce1d3fee3f348c3fc8e7ace52324b2a38368553dfea131d3582a257ecb
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=mha+heroes+rising+full+movie+facebook PDF link annotation
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/1fd15db4443db.pdfIn PDF document text
    • http://fogazino.iblogger.org/torebopibudurimabamaxaxa.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/68c753.pdfIn PDF document text
    • http://pomanonorajalam.22web.org/13730752392.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/netepa.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/liwin_fopezedanom_lirinoruwe.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/4ba3a62fd729.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/samsung_nx_300_price_in_pakistan.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/susakodelali-poxada-mejiwadit.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widetunipet/97182177240.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_19adfda36ff243a598a557412e4020fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fd76bc-a972-42a5-be76-495706349acc/54093971440.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/zavike.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_327b2dad51334eaa8e14dff075eb0d05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/fgo_camelot_final_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/what_is_meant_by_karst_topography.pdfIn PDF document text
    • http://mefirakuk.epizy.com/how_do_you_make_garlic_sauce_for_pizza.pdfIn PDF document text
    • http://nupawibufa.epizy.com/zewaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206921b7-ba58-4854-b233-f7c8bd2454c0/2020_lexus_es_350_hybrid_mpg.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_17bf26ef2fe24a3ab1ff790fd1f4d39c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4add3207-4e72-426e-9aa5-571a892e7d93/real_estate_certification_near_me.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 1656 bytes
SHA-256: c78bbe652e95956111dc3d6f480ebb2e2d0f2f5a1e5e14b7a65888dea692a862
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 3060 bytes
SHA-256: 455ba8f9f3ba09278a5664f05dd7bf58b2ac37ee265dad0a9ea3059e71ff3aab
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 5564 bytes
SHA-256: 13a8f301d728b1f3d681108e0161a4bc9190c657007312a60f01587e9835f1fa
font_03_sfnt_off0001190e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190E 16892 bytes
SHA-256: 3923a2bee34df852c5bce0cc1030298ed14c1eca192d69f01a44f44aa31b138c