Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aac6791f24acec7…

MALICIOUS

PDF

80.4 KB Created: 2021-05-20 20:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f709b5b59b1c04a2ef7823081a3a9c25 SHA-1: cf6d2b19cc094b93ffba030055e3e1e245095eba SHA-256: 5aac6791f24acec742bb8e60a39feba3ef69eaba0f6079f3ee7d91fc93e2a909
156 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 0.9998

Heuristics 5

  • 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.
  • 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://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/29d839733e46e81.pdf In PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/mevilogafepak_taxajuxodinolum_xapanivarab_favizunenanoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_60651da6c96c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468259/normal_5feb8ffe26023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_601b483fd67aa.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=how%20does%20wechat%20time%20capsule%20workPDF link annotation
    • https://uploads.strikinglycdn.com/files/c224f273-c19e-42e2-99d7-c685e81da504/68881666570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b71a9cd-0380-4745-89ff-3289805e6e80/rl_flo-master_2-gallon_foaming_sprayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2b6ab5-e319-46b5-b809-5ca61209d4f9/the_fall_of_the_house_of_usher_edgar_allan_poe.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/35958662934.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/multiwii_2.4_configuration.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/armstrong_ultra_sx_90_furnace_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0fed0a-793e-46e0-b016-8297682ffa47/how_to_connect_to_blue_parrot_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80abb540-4f07-48ab-9141-6fb7089dbb4e/how_to_wind_a_clock_with_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b902ef-3a34-49c8-b854-d155960951eb/imax_b6_lipo_balance_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7086a90a-e112-40ce-b6bc-e6152933fc80/english_grammar_exercises_ebook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec085bd-8b1d-49db-9242-7b195b158352/vipok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4906bcda-f655-4e6d-89cb-92c236afce77/27615083127.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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 5204 bytes
SHA-256: 0929f2a1269e450383e6d803e82341ba458021999d04cf25d50c8346726df279
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 11116 bytes
SHA-256: c2eb9e8fe8166fbb2137565538fea9179a7d78a2a87bea4864f051015de7fad2
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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