Malicious PDF — malware analysis report

Static analysis result for SHA-256 46251ae00ef92852…

MALICIOUS

PDF

72.5 KB Created: 2021-02-22 08:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 02a82cae2c5faf7116d6772770758420 SHA-1: c0719f51225604a0778e6b309dfdd0a4af496d9a SHA-256: 46251ae00ef9285230b8451a546244be840f8539cf7566398ce52fcb5d9913b1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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://seumenha.ru/123?utm_term=how+to+bake+pizza+in+convection+microwave+oven PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420248/normal_5fce24f6f0302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_602ee909d293c.pdfIn PDF document text
    • http://logvoz.ru/sony_wireless_bluetooth_headset_manual6pf4x.pdfIn PDF document text
    • http://scriptbook.xyz/wewazasiviromjnlm9.pdfIn PDF document text
    • http://opit.space/1074402139sp1p7.pdfIn PDF document text
    • http://bugamuwilozibil.22web.org/37854407921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5fda950c5da7d.pdfIn PDF document text
    • http://puzososiv.22web.org/72260865109.pdfIn PDF document text
    • http://wewifodajukovu.iblogger.org/report_fire_hazard_nsw.pdfIn PDF document text
    • http://jedufozares.22web.org/catalytic_reforming_adalah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kirotomi.epizy.com/cassie_ventura_songs.pdfIn PDF document text
    • http://bozivexaterem.epizy.com/skeletal_system_in_porifera.pdfIn PDF document text
    • http://jipobemimojogot.rf.gd/gifolopumamufudibax.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 5236 bytes
SHA-256: e3c8ea0029b7aaf07432371090cb9d4e04ba26c915c5b3d11149534dbcc08c74
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10948 bytes
SHA-256: 0c4240e815d4ff3e3b96e8191b6d3305ffc53dc953f65f490fb7708c95ecd65c

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