Malicious PDF — malware analysis report

Static analysis result for SHA-256 676e9812f61939a3…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 14:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 420c3fc25c77aa6dd20e234890259ab0 SHA-1: 2cfeb62804a742efd1ee484021e4b5eb94d1c509 SHA-256: 676e9812f61939a32d6be45b3b8437ac0c7e8dbfb54d7ccf6658fae537f55798
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model also indicated maliciousness. It contains multiple embedded URLs, including one that appears to be a redirector leading to a domain associated with phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to cable TV remotes, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=how+to+connect+time+warner+cable+remote+to+tv PDF link annotation
    • https://cdn.sqhk.co/dagufiwus/dAeigRA/gukakizofufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6011f1442c78d.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/hiJBhi6/vocabulary_builder_app_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_604714f130381.pdfIn PDF document text
    • http://myfavoritesun.xyz/gekasomirekosottvntc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_603357f5b37e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_6041621cc6594.pdfIn PDF document text
    • http://simcars.ru/come_aggiungere_stickers_su_whatsapph8p53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422161/normal_5fe4638ddbd5d.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/ielts_speaking_questions_and_answers_2019592p7.pdfIn PDF document text
    • http://vapokox.22web.org/brush_up_your_english_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/Bgg1ugg/34925671954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503767/normal_604fadf3c0956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikukasosisado.epizy.com/f_to_c_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/linewesabaxup.pdfIn PDF document text
    • http://defurujaligat.epizy.com/70092877498.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/72438284410.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_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 5020 bytes
SHA-256: 1f43c5b65cec2c54242fd6af9c854e3daf7f98c0bd7065d9b6de3067f7749830
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 11312 bytes
SHA-256: 7bdd48df2ec7ffdd20b9ac28f8aee279bd02827ef44a8d18010888e10f79155d

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