Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99b6ea8c626519b…

MALICIOUS

PDF

72.7 KB Created: 2021-01-11 13:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 799be50522c922c61f35a805016046b8 SHA-1: 533cb6afc87fcd154a5905efc3bf19590a88d8c0 SHA-256: a99b6ea8c626519bbaebda9f165859d325c4e48c013080ec65792e405b6d117a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to drive traffic to external sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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.
  • 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://trafficel.ru/aws?utm_term=evaluation+form+for+employees+templates PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5ff71bbe6e09a.pdfIn PDF document text
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/bawisogitufe-pudajiwovavu-zotebutija-butaruvedeximi.pdfIn PDF document text
    • https://cdn.sqhk.co/kixituvelil/46Ehcii/at_t_u_verse_modem_reset.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5fe44c2c6c3ca.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/wamapapebule_vibodogeku_pasojawar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_5fa6f9ef0931d.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/didefetuvorewupa.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/cAEIAjf/archery_world_cup_winners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fcc9b69e7e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fa24a8687b1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410674/normal_5fe4d6be75688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5fc562e263fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5fd111102b227.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/kovilowab/gta_5_free_android_aptoide.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/bupuluramozemisilowukatus.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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 5164 bytes
SHA-256: 6e29cae25fd8ea132ce11b6d841f0ec926e210deec605f1ac33916f4a8e99e9b
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 10844 bytes
SHA-256: 657e5803074b597042eb916b24676ce8d6e5a7d8b14aeedede52d5cf933e19bb

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