Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cfc8a00b134183…

MALICIOUS

PDF

59.8 KB Created: 2020-11-18 08:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b174d8921039a4b5aedafb2233ae1143 SHA-1: e8d057c82d02bf788421ceef6415a181838b9f79 SHA-256: e0cfc8a00b1341834090da3954a99d391194d5c6286941ddf8a8cbd5211c377e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or distribution mechanism for further malicious content. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=unit+1+vocabulary+workshop+answers PDF link annotation
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/6eb3ab.pdfIn PDF document text
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/temobitinukupet-xidezunadasugas-rujud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f97a59a4d5cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f9b8ecf376c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fb373af770b0.pdfIn PDF document text
    • https://tokadasokavetim.weebly.com/uploads/1/3/4/6/134688198/75f09cc060387.pdfIn PDF document text
    • https://sogovowezop.weebly.com/uploads/1/3/4/3/134324678/5351040.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/jusokajewarub-rexukewigez-femarab.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/1949415.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/b526e95b-67c3-452b-9995-1a1f54b6a5bf/33477761715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025eb230-0d85-4307-aef1-af1cbb7b4534/binexuxenufudufesurovuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e41847-cbde-42ce-b730-9ae87df66ea7/.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_off0000ac51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC51 5520 bytes
SHA-256: 07e4444fe53bb6ecf12d7ed3a5102b14ac6cf48121069a6c3ba9610c943483af
font_01_sfnt_off0000bf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF35 11004 bytes
SHA-256: a26ae7c33bb542a13e1aa74d0236631890f242aaa83f29a80f3a93bce7045cc7

Open this report in the interactive analyzer, or submit your own file for analysis.