Malicious PDF — malware analysis report

Static analysis result for SHA-256 12be9ba3dd399142…

MALICIOUS

PDF

88.0 KB Created: 2021-02-16 11:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d228a5e9b919d9ff64734328e0dff60a SHA-1: dec70e6e4aad21ee73f488354ce8fcd441f12af8 SHA-256: 12be9ba3dd3991422a5a000753b133f25e6e5a344dbaa07d5f28ce2a5038b501
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/123?utm_term=innova+3020+review PDF link annotation
    • https://cdn.sqhk.co/numokafas/hgAXici/live_sports_tv_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/icFBFii/sejupofinefipigo.pdfIn PDF document text
    • http://raifaisentgo.online/80372982069pp1sx.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/formation_comptable_pour_chef_d_entreprise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5feb9636482de.pdfIn PDF document text
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/2519560.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/c3hbvhe/boy_longer_hairstyles.pdfIn PDF document text
    • http://limons.space/94248442570u38f1.pdfIn PDF document text
    • http://predouche.xyz/civil_service_exams_nyc_study_guideapcxy.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/0gcghc4/likigabusebeli.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/ejejipk/supazos.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
    • http://wetoxikilosawa.epizy.com/journal_ennahar_2018.pdfIn PDF document text
    • http://wasaxotudulolo.epizy.com/jisolalogarakagoreniduxib.pdfIn PDF document text
    • http://vefovax.rf.gd/platform_film_ka_gana_dijiye.pdfIn PDF document text
    • http://sijaxulo.rf.gd/43660351273.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 4704 bytes
SHA-256: 3c9e0982324ead54bc40ac3dfb9fa7ff7b8cff840aea3ccd39f55e57c5f87773
font_01_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10728 bytes
SHA-256: 89a9ee4f253ad2f191194f6517befe5fab73194f98c831e4ec3e2d724a4f5863
font_02_sfnt_off0001451e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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