Malicious PDF — malware analysis report

Static analysis result for SHA-256 3703b5b14eba726c…

MALICIOUS

PDF

75.2 KB Created: 2021-02-17 02:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ac0ce83dd864e88aa950e5579a9da2c4 SHA-1: 81631611814ffd636091c878e6a611c779308ab3 SHA-256: 3703b5b14eba726c2a077f3bb511d7ff1dffc73855422ffcaa97178e598d441e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution intent.

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://bologen.ru/aws?utm_term=2004+honda+element+manual+transmission+fluid+change PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501486/normal_5fed5772e4421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_600dc372a041b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_6028ebd25a07b.pdfIn PDF document text
    • http://persequenteamsohbet.com/rune_factory_4_event_guidelf5dd.pdfIn PDF document text
    • http://autoport76.online/653738969523vgdl.pdfIn PDF document text
    • http://teksalon.xyz/xenejekos8vmvq.pdfIn PDF document text
    • http://shopyou.online/statistical_methods_for_psychology_8th_edgk5hw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5fc87a8f3ec84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_60294223de932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_60103bce069a5.pdfIn PDF document text
    • http://digtalcaliper09.xyz/zutupamginwm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5fc746287673d.pdfIn PDF document text
    • http://helpcontactform.com/10770092954svehn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490953/normal_5febeb264a318.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/godewumazek/zuzurogegulawokemaperiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/angular_bootstrap_modal_form.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_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 5704 bytes
SHA-256: 3e9dbbc5436cd97a7c0927b59c3eced4a326b1e956146d6bf64b7c23246a42c2
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10308 bytes
SHA-256: 4a7b23ea35f38cf2cb7471733f871c77529ae2e9b19bd8655f6576d15bf0576d

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