Malicious PDF — malware analysis report

Static analysis result for SHA-256 517a055e38a0e022…

MALICIOUS

PDF

91.1 KB Created: 2021-04-04 13:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3faa41fcd50a407ccece4b07df41a8a6 SHA-1: 125c54d3e3a775db8905ee109eea4e46068ef372 SHA-256: 517a055e38a0e022d8de68f114f1a7bf8b5c508df0f4d0b324672c72eb97186c
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=rival+crock+pot+smart+pot+recipes PDF link annotation
    • https://cdn.sqhk.co/ganuniwiku/cMQ5jc6/dragy_app_review.pdfIn PDF document text
    • http://kefojixesopu.66ghz.com/kick_off_meeting_checklist_and_agenda_template.pdfIn PDF document text
    • http://pupijepu.22web.org/82935396806.pdfIn PDF document text
    • https://cdn.sqhk.co/relulapezele/OheOjgD/pufekigema.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/geniaW3/44536409892.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/Bibjhha/kudoxefevotazo.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/kiromurufunufirefikelefi.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/77gdHjj/nba2k20_locker_codes_vc._org.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/gBGU38a/arknights_twitter_kr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ragepipajuwase.epizy.com/89738349409.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_4451d56bb1bd41fc9c65702bfb0fc2d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/degree_of_comparison_worksheet_for_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/lego_star_wars_character_encyclopedia_updated_and_expanded_with_minifigure.pdfIn PDF document text
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_8ed1db7b604b4df79b6dda552bae9ecd.pdf?index=trueIn PDF document text
    • http://vefafovapekaxa.epizy.com/analog_and_digital_communication_lab_manual.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_ad3400c6cb3143d0a3fcb613fc291eae.pdf?index=trueIn PDF document text
    • http://zegemipufe.epizy.com/34838122468.pdfIn PDF document text
    • http://fizuvofodiku.epizy.com/how_to_help_child_with_anxiety_about_death.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_bebec9864f5e44f5a8a9b126547b9acb.pdf?index=trueIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_b28cd5da54224b01bb1eefa64e2d2d6f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 5208 bytes
SHA-256: bf2d1f8f6d7cb6272b544964a580efda5601e7aad6b945baa982a354a5e8ae47
font_01_sfnt_off000137c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C5 11204 bytes
SHA-256: cd2fa1ab62245db269ceb7b64186df0a458da0ea22d44919f3b0a9ab5c69a04b