Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b76a4288fe963b7…

MALICIOUS

PDF

72.6 KB Created: 2021-02-09 23:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 457cf248407905e05b55daf953aab542 SHA-1: 231e8845721b0396731c1304fa7fb856616c4ef1 SHA-256: 6b76a4288fe963b7fc471f8a74dd298781cf68a1ffe1d2757f41e4dd7fbd473d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. One of the primary URLs, 'https://jottigo.ru/aws?utm_term=horse+games+no', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jottigo.ru/aws?utm_term=horse+games+no PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489844/normal_600fbe55c2ae5.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/gieid4c/tennessee_titans_record_this_year.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/gehe5jg/dallas_indoor_skydiving_center.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/1482053.pdfIn PDF document text
    • http://verification-help.com/boy_meets_girl_full_bookvoup5.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/HwgeUhg/31421674096.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/xekawagofawasum-mumisasiruvuzog-madimivuromego-bazatifavog.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/brzjbTL/crowded_house_sauvignon_blanc_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/Vibgfhe/oxygen_levels_in_adults_chart.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/4994860.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/8869892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/najubu/8828008927.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/bodavafovekaba.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/aquinas_college_ringwood_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/80202860299.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_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 4932 bytes
SHA-256: a9dd081db2fe66dec8c2757655ffd7a06304bde35259a2ca7542081f4b8c02b8
font_01_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 10548 bytes
SHA-256: 72be5286d7da30ab20817d94b8e1a5447d31e5cf77b91b75683409674edb310e

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