Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99e1156c63a5ece…

MALICIOUS

PDF

62.8 KB Created: 2021-01-09 16:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 07f55c623c4eb6105242fcbc37d8588e SHA-1: e889cc20ef481de06c77ecca10085f125ca3f2ed SHA-256: a99e1156c63a5ece9699eedfae2b0cd1b1d03e4a23678a98c62abc9b612f158e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary URL, 'https://trafffi.ru/123?utm_term=under+pressure+bowie+bass+tab', appears to be a lure, likely leading to a malicious site or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=under+pressure+bowie+bass+tab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474998/normal_5fdaf5bf82525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401538/normal_5fed6c6927e39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_5f988904a2e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5fadd21599c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f9d050e923eb.pdfIn PDF document text
    • https://cdn.sqhk.co/zavufepugife/dapjgjb/neighborhood_market_walmart_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/fGAlEij/3590602249.pdfIn PDF document text
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/31a2832224f.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/hR74Qha/54953247792.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/5926884.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/xupepenen_bupakebesilud_muwob.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/ghjfjje/73902062443.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/3858543.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
    • https://s3.amazonaws.com/vuterijoze/pobekobeka.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/71393231202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88ecdc1-d264-49ab-aba8-a1f44595cb39/used_jr_dragster_engines_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470229c0-ffab-45ae-aef7-6f8bd248f8d5/rse_practice_skills_assessment_part_i_-_pt_ccna_4.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_off0000afa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA4 5028 bytes
SHA-256: c9d7ca57dd363e4193af6cad3fcd2a0b0b1ccf209d7e5ff69cdf913d2d95c0c9
font_01_sfnt_off0000c0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 8488 bytes
SHA-256: 425e72bbc790f53e04163cca9a9a515fca8ffa520a0f76f73c2ee9a7b3df9b04
font_02_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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