Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac1a769fcc9d79d…

MALICIOUS

PDF

68.7 KB Created: 2021-06-14 10:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a59ace9ee52f899e7d63b845a76cec1a SHA-1: 2d37ae02f21369d4fece0a94921ac8f043d2db24 SHA-256: dac1a769fcc9d79d85a8d1d281710b21eb93e01263759f2f39ad29ee72788de2
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 0.9998

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://nomylo.ru/pbw?utm_term=introduction+to+operations+research+11th+edition+pdf PDF link annotation
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/zirud_povopefaxik_tagilavir_telukuzetenovo.pdfIn PDF document text
    • https://boxorefo.weebly.com/uploads/1/3/0/9/130969922/243a738748.pdfIn PDF document text
    • https://remavugotidub.weebly.com/uploads/1/3/5/9/135962193/fazuzaza.pdfIn PDF document text
    • https://veranaza.weebly.com/uploads/1/3/4/6/134665567/kesifukep.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/tugafigotimidariguru.pdfIn PDF document text
    • https://pelofaneb.weebly.com/uploads/1/3/4/2/134235527/pevunudivimidova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_601dfdd4189fa.pdfIn PDF document text
    • https://megimopitujoni.weebly.com/uploads/1/3/4/6/134681749/tovofe-devujil-zekap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_600a6fdba15c8.pdfIn PDF document text
    • https://jogapemufa.weebly.com/uploads/1/3/4/4/134492880/bdbcb5590e.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/a409ca53-a3be-47f4-8d95-35417e27fa1c/wanepegimok.pdfIn PDF document text
    • http://pefumugat.pbworks.com/f/fivozugebuzemixaxapek.pdfIn PDF document text
    • http://jadubunid.pbworks.com/w/file/fetch/144635115/what_is_the_advantage_of_functional_structure.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/f/prime_factorization_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3bdca2d-96b6-4461-a6e4-c785b53b559c/vizute.pdfIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144620118/30442557746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e099bac-a205-4b25-ae2e-07769603c546/comptia_a_exam_study_guide.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/lotus_notes_client_9_0_1_free_download.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_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 5200 bytes
SHA-256: d2539b336976e7cc74ce18280e754b6d0dfbc09efa5a76bd31b3f391511acd5f
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 10088 bytes
SHA-256: 7be6e55a964e724706cd5e439366aa22e1bf94b6a6a2d319201f799669312986

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