Malicious PDF — malware analysis report

Static analysis result for SHA-256 71337c13b80f3c9f…

MALICIOUS

PDF

90.2 KB Created: 2021-05-28 00:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eea4a40d9159194d33427b5ea4203bf0 SHA-1: 64001cec9d9ba0524969edff5d9731444faa9831 SHA-256: 71337c13b80f3c9f94277b960890bacd3cd88ed088919032080ae71fe3103311
186 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, identified as a link farm hosted on disposable domains. This technique is commonly used to distribute phishing lures or redirect users to sites hosting malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=essentials+of+medical+biochemistry+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475383/normal_60302cd5908d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_601041491ff96.pdfIn PDF document text
    • https://revarepafe.weebly.com/uploads/1/3/3/9/133997647/6dd7dd151da0a29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371808/normal_5fd09931573ce.pdfIn PDF document text
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/96d132513.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/wiwetefataket.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/1360606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_6018ae637b716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_6042d1880774c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5fe03c65b9ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_600e8afd1bd92.pdfIn PDF document text
    • https://jowewuxutezu.weebly.com/uploads/1/3/4/6/134632231/sojaxepopez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_5fe7168f3de43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_60081c190f6cb.pdfIn PDF document text
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/3735634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_602a52c7afc85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_605d7f7ad00ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_601d3f7b6322d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375070/normal_60099e23763ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 5596 bytes
SHA-256: 6bbb3464e858d412151251a016c3e5daa8564ef61cd709a4eaeafc0ce548a229
font_01_sfnt_off0001326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 12072 bytes
SHA-256: e6ffd578fe846c9a377f8565f4702b8210619408bb4b0865a54f6d1fd1e94cd2

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