Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2e0b40b91ed86a…

MALICIOUS

PDF

68.5 KB Created: 2020-11-21 18:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f60e650032bc5f14b0d3032fbb1d8535 SHA-1: 2ef6d24b7b0825f65fe7dce7dd487de527e1712e SHA-256: 1a2e0b40b91ed86a5a80c178c18c44f75963fcff826b9e8fafb814e12200f881
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/123?utm_term=parts+of+a+clarinet+diagram PDF link annotation
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/6564699.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/kimeme_midugaku_murelana.pdfIn PDF document text
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/xawixaravoniv.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/264b68688e0a.pdfIn PDF document text
    • https://welerenumabo.weebly.com/uploads/1/3/4/4/134467224/rijeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5f8f5718b4cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5faffe47c6dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f8846778d810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5f8b824ed708e.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/48cdcad4b.pdfIn PDF document text
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/5252802.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/e9529680330d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3783b3-bd2f-4b35-b50b-35a3bf426bf7/zedux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec05a3f-5322-4bc9-83c0-381bcdceaea9/zimeparakeporojoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebe0e7d-6823-4611-92e0-57200445b804/92083587578.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_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 5340 bytes
SHA-256: 279a4543f1948c2512cd0c53150e94319674031965b83c8cacc33691cb7c9013
font_01_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 10476 bytes
SHA-256: de5169d251f7e6f93a8bcee74dcab3bf5983af343cd91426c640eca3d2ec941b

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