Malicious PDF — malware analysis report

Static analysis result for SHA-256 8048ba4d1352de61…

MALICIOUS

PDF

71.9 KB Created: 2021-03-04 00:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4903b97b57a50d9f2cdd9a8541675bd7 SHA-1: 344f88f87e0a25c019f4159c6c82d5965cbd25d5 SHA-256: 8048ba4d1352de618c0f1d6eb1a8de274e297265a2a290ed9946b8c61377edfb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=ruger+10%252F22+cleaning
    • https://static.s123-cdn-static.com/uploads/4470679/normal_6008e013015c1.pdf
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/8951708.pdf
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/8835384.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fd2caca756ae.pdf
    • http://topplafond.xyz/71912038330iuvwx.pdf
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/3254d63cb6420e.pdf
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/mumuzilez-nivosedawi.pdf
    • https://guzarimu.weebly.com/uploads/1/3/4/6/134608133/sonuledegabaruf.pdf
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/pisezamedog.pdf
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/minumatolobineninizu.pdf
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5fe41f5c56dda.pdf
    • https://static.s123-cdn-static.com/uploads/4471474/normal_5fef1543bc227.pdf
    • https://lomepulovu.weebly.com/uploads/1/3/4/6/134654159/3702653.pdf
    • https://cdn-cms.f-static.net/uploads/4381344/normal_602b77c41ccff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuvovoxigumuz/gidobujipanuparid.pdf
    • https://s3.amazonaws.com/povelenavuviw/immersive_engineering_starter_guide.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/hettich_centrifuge_eba_21_manual.pdf
    • https://s3.amazonaws.com/zedilegol/graphic_design_jobs_atlanta_ga_entry_level.pdf
    • https://s3.amazonaws.com/bomupi/wheel_horse_rye_whiskey_for_sale.pdf
    • https://s3.amazonaws.com/nosepevozux/full_form_of_pcod_in_gynaecology.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc26.bin
de7ac4af588d2b29b423d7c5ab05ece974625c01ffad94ad0b13a987f361e7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 5156 bytes
font_01_sfnt_off0000edd6.bin
29b488083e3caf1de6ae27798f5ea21f632e4bb869a5b2efe77da6fad9db7cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10892 bytes

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