Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1b3d6396f72888…

MALICIOUS

PDF

77.8 KB Created: 2020-11-26 03:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ddd6d39a1c109707eadaa93f1c0ee4b2 SHA-1: 23b454b9e9c447610d31a786153020de9685539c SHA-256: 0a1b3d6396f72888ded9cadf6c0eff6c74e85316745110a7893e1e099c5a9132
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=the+hedge+knight+pdf+espa%25C3%25B1ol PDF link annotation
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/6684621.pdfIn PDF document text
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/zidale.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/3ba64.pdfIn PDF document text
    • https://busigejog.weebly.com/uploads/1/3/4/0/134017549/8462487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5f9c5f8fbc9d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fb2ac7f3813d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fab62f37804c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_5f9ea00de6e74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fbc945073495.pdfIn PDF document text
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/jebel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467306/normal_5fb299cc13262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5fa6f556aebc5.pdfIn PDF document text
    • https://wavupuzubeje.weebly.com/uploads/1/3/4/2/134235525/9090526.pdfIn PDF document text
    • https://kapomubevobi.weebly.com/uploads/1/3/4/6/134681937/powekena.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/pevapopavogetukaziwa.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/dagovirowar.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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5432 bytes
SHA-256: e2b7c4f797c4838a039080ae1e88f5e249cf159460a75bbdc99f6732e6c2bbc2
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 11648 bytes
SHA-256: a30ab251b2a56aebe895f74bf28b0d3a0d31faecbd5f4b63f23d8fc348a953eb

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