Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82250154a880a5d…

MALICIOUS

PDF

78.9 KB Created: 2020-11-13 15:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ac22a3dd366d7752c1a2eafed79b5312 SHA-1: ba4f5f6ee6ee07e116f5ae669f3d5381eb666966 SHA-256: f82250154a880a5db4880bdf98202a047583f4d6ad3a719f07d76d6a57fc57ba
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one key URL, 'https://trafffe.ru/123?utm_term=the+pit+and+the+pendulum+symbolism', is flagged as unknown and is likely part of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

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://trafffe.ru/123?utm_term=the+pit+and+the+pendulum+symbolism PDF link annotation
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/juvuto_jefesarojajaluw_wevar_jorivukak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8df59c054cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5f9f69de8eb29.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/jefefowelo_nazepasisedina_refuzixipuzijok.pdfIn PDF document text
    • https://balijuwil.weebly.com/uploads/1/3/4/4/134403438/67db595318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5f94f25591110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f887cf40d7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5f8e485ca61be.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/wajibile/us_history_regents_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/resume_building_worksheets_for_teens.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/plugin_internet_explorer.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/27657177082.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/39292530360.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 5

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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 5176 bytes
SHA-256: a3b2d0c06dc835479b55fe33099a680b4e4a76d3abb229ba11884c33c068c777
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10600 bytes
SHA-256: 625d5bef5d4792300a78100f8ce16a71060e28246bc38c8e22d6ede6b797d214
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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