Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d81470bb999e380…

MALICIOUS

PDF

78.0 KB Created: 2021-02-21 15:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e9c6943a1463df9b98e91a700d5829ca SHA-1: 61a82100863e4e833e4fad84f53ebd81c1ffe531 SHA-256: 8d81470bb999e380d9bd3c556f24562c633cad4971a172dfaf6d9cd23f7c52c6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to 'seumenha.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

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://seumenha.ru/wix?keyword=sum+of+arithmetic+and+geometric+series+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480889/normal_5fda774f5c782.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/gokixofepaxexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_601b002a7468c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491414/normal_600aac560c987.pdfIn PDF document text
    • https://vudunige.weebly.com/uploads/1/3/5/9/135981242/kirebujomexi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5fe076a7eefe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391317/normal_5ffd368a093f6.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/tefuvif-norunogogazodok.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/kiperata_migitorog_zafuriv_vedula.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/xawaja_komeluxadet.pdfIn PDF document text
    • http://jopalebifu.iblogger.org/zutifamusulapijixanipano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447251/normal_5fe5ab56519cb.pdfIn PDF document text
    • https://vojerured.weebly.com/uploads/1/3/3/9/133999986/duxufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fcf17c95d2ea.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/pidufozu/vuperite.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/chicago_tribune_sports_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/menofajenuxotififamewejur.pdfIn PDF document text
    • http://tavejetenugaku.epizy.com/marshall_cavendish_english_answer_key.pdfIn PDF document text
    • http://fadadopotonu.epizy.com/dapagulifusefikeg.pdfIn PDF document text
    • http://malebujezasipip.rf.gd/82027575459.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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 5544 bytes
SHA-256: c5aaab0bc5450af1e7917b49e007d8eee6a2e7338262f1054f6f1cdab1a319cf
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 11968 bytes
SHA-256: 1fbe18f9aa69fc2ee887a8191bc55ebcfe28029c3aa2fc3a7f84ae491ce033ae
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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