Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f71edb7985e85e…

MALICIOUS

PDF

90.4 KB Created: 2021-02-21 02:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 907d62429ecfba3779d6493c70d280de SHA-1: d1aad8598357bb3c7980ab3f1014c417284f260b SHA-256: e6f71edb7985e85e5d623ff2f7dc2fb504d6e5c1c06790ed01f6fbf03a33cb3a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('leonvi.ru' and 'yewes.fun'), suggesting it functions as a redirector to phishing or malware distribution sites. The PDF structure and embedded content are consistent with a malicious document designed to lure users to external resources.

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://leonvi.ru/123?utm_term=diarios+de+motocicleta+characters PDF link annotation
    • http://yewes.fun/kikanajekimofox0tj5q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428054/normal_5fe57c6c3022b.pdfIn PDF document text
    • http://befigter.xyz/celi_3_testpkb4l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_5fe5d4f60429c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_5fd675d67f09b.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/fjdyz5T/sdsgc_tier_list_fr.pdfIn PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/985c9bf5c4.pdfIn PDF document text
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/4995800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480750/normal_600fd63de842e.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/2089189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_601de5e762785.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/wiwamoxamo/what_did_the_martian_say_when_he_accidentally_landed_on_venus_answer_key_math.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_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 4860 bytes
SHA-256: ee1720bb76455a554934f1cf678468f41a49e2cf4bd853c8d64947b5d12af5ea
font_01_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 12760 bytes
SHA-256: 0b145b0ddfb399ea327e14442b76f0560c061beb8ed3e4f46f11b53d6c877b50
font_02_sfnt_off00014e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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