Malicious PDF — malware analysis report

Static analysis result for SHA-256 881a7f673c9901bc…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 08:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3b8634b9db91243d4d46cc6b98bb38e SHA-1: 5fac6d4aad409ada55f57b5df6ea789bf956498e SHA-256: 881a7f673c9901bc75a4a85232a6dce6ad3cdfc306d596039b9704e195e5a586
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 0.9997

Heuristics 6

  • 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.
  • 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://xajibur.ru/wix?keyword=minecraft+future+client+tutorial PDF link annotation
    • https://cdn.sqhk.co/nulojokine/gdAfpha/wufunubusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_603aefb887821.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/xgjhhjr/gofukupatotowiratij.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/hdiaibQ/73119180444.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/geidia7/super_cobra_jet_mustang_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377095/normal_5fdd9516a541f.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/mushroom_farming_in_zimbabwe.pdfIn PDF document text
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/4556100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473645/normal_5ffe272fcd2fd.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizozife/giiTgjF/operate_now_animal_hospital_download.pdfIn PDF document text
    • https://dafozadojav.weebly.com/uploads/1/3/4/7/134764431/kewuserivo-nagox-nuwogobewitaf-muzebobotetago.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/10211291112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_2041e37f1f9943568fbd3497083954cf.pdf?index=trueIn PDF document text
    • https://db22a0a0-c6c8-4eb9-9878-037c50d93224.filesusr.com/ugd/e2b5b3_e516d6b1b2a04076a59dd2489862a7a6.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_44f7e0f366b046b6b07e8d225817e511.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/robert_kiyosaki_books_collection.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_374c182bea114e8b91e12ff1d198e9a1.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_06c98a4b6c4d4e2e96eaea88e4e99936.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/bexusefeb.pdfIn PDF document text
    • http://gajamozaxekega.atwebpages.com/anaesthesia_for_spine_surgery.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_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 4700 bytes
SHA-256: be7e816e826c417f7e9777f43050b89b5937c6921396c559a8638de7b5b6f892
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10984 bytes
SHA-256: 5b6989854a0c15cbec55387109387934e8a0d23ee6d0f7e738c0c88851a57307

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