Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8480ef2b1c7d47…

MALICIOUS

PDF

80.7 KB Created: 2021-04-03 02:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3f5608de81cd2a7197d3b2569920576d SHA-1: b7a6009275b9db3180b8c065e0e4157f3fa5b13c SHA-256: 4e8480ef2b1c7d47dc17b3e441396504d246bbae5fc22061f515dbc157f861d6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://zajinet.ru/wix?keyword=areas+de+brodmann PDF link annotation
    • https://cdn.sqhk.co/vifutetax/hpibjcU/12685644447.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/what_does_the_term_brown_bear_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/jgujcgd/83281518292.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/6EEijgc/88422634124.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/8zt2gft/blades_of_brim_online.pdfIn PDF document text
    • http://momarivido.mypressonline.com/tavupalul.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/what_were_given_emphasis_during_the_golden_age_of_greek_sculpture_brainly.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/Rghijgg/guacamelee_super_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/badiwugaleko/egfjjic/laposup.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/or9C9gg/xozemanoxokupedimiw.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/culjjUq/12109180755.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/dell_latitude_e7450_keyboard_and_touchpad_not_working.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/baixar_aplicativo_apk.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/a28656ed-24d3-4efa-9501-ec820b8ea1a1/how_many_reps_should_you_do_in_weightlifting_a_week.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/schaums_physics_for_engineering_and_science.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_c4d4b7709bc1407891aa80cd8eaad0ae.pdf?index=trueIn PDF document text
    • http://sinusisokopex.atwebpages.com/wodejisupajodunerine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07aa1361-2c4c-4ac0-be99-374fc5f526e3/comparatif_ou_superlatif_allemand.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_acf8c29cdce54299b23a9410cfde16d1.pdf?index=trueIn PDF document text
    • http://resilasijajatil.myartsonline.com/renusirijeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642cbd96-1fa0-473c-964c-4a5a4793154a/nesimulam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 5068 bytes
SHA-256: 8c367451c27f0521ed1204863aeccdc3a0d4d454a5c0505851086c185859600f
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 11080 bytes
SHA-256: 593ef0441d6b3ab70530bfaab35c611d4f6e1a72fef1dac4480acf7eb1df2db3

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