Malicious PDF — malware analysis report

Static analysis result for SHA-256 634f12001c59db42…

MALICIOUS

PDF

74.1 KB Created: 2021-04-03 22:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 96d285f45f4e88bbcf68fe5e065ce636 SHA-1: b7c97d05534757d033f2a2c0fe0b48746e5584a6 SHA-256: 634f12001c59db428dc0cf66b1d3312b1176715f8e18e0ad72a3c2041579d4c9
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 0.9997

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://ponafet.ru/123?utm_term=the+jim+crow+laws+worksheet PDF link annotation
    • https://cdn.sqhk.co/ganidabizi/3Ficr0V/giropudawevofig.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/haHThiu/best_spelling_and_grammar_check_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/DkhWcji/lakipe.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/7405667.pdfIn PDF document text
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/8894576.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/pivilewuxubi_nozufibineb_runevepar_zemujegigina.pdfIn PDF document text
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/ruxikevekezi.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/jajeTic/off_road_4x4_hill_truck_games.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/fMhbbhg/cleaner_for_whatsapp_old_version.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/8541695.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/diicmjc/livena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4f2c11-93fe-4eb6-8204-6b2df074e645/how_do_sociologist_define_positive_deviance.pdfIn PDF document text
    • http://wewiritat.epizy.com/48496411493.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_7a0eccba12df4d5f929627a7f262a9d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d70060-3b97-497b-8c92-1143f07c9f45/39198016324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28eabe5-c05a-4226-b39a-46bb587d810a/piaget_and_erikson_stages_of_development_chart.pdfIn PDF document text
    • http://zupifimiture.rf.gd/beginners_printable_bridge_cheat_sheet.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_1e9bd9f4bad84301a70848a6925f4e26.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_bbba5c8e43cc4aae8fae7417c5c05840.pdf?index=trueIn PDF document text
    • http://modedavap.epizy.com/dodie_viola_sheet_music.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_c293180ca69e4cd1935101289be14716.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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5220 bytes
SHA-256: 223be915a328d9284c05af166e67649ebd9c3b521158bd4db2f56ec98a62f3ee
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10788 bytes
SHA-256: c18ed15848daf910facaa486b75e69b06e2d83361617c9d81f99fea719751048