Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f0c85a4bd3ae7…

MALICIOUS

PDF

71.8 KB Created: 2021-01-03 23:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f8ae126298156ff437f16b5950af41a6 SHA-1: b5a9b565499979ab7230bcbe54270a68796cb317 SHA-256: f81f0c85a4bd3ae7d1a815f5ed44f8f3e4ff98609af5a49b0594953b902eac50
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, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=forest+park+park+district+rental PDF link annotation
    • https://gejosubirimo.weebly.com/uploads/1/3/0/7/130776575/602952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f87e9c8c013d.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/suwaxoxotelov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5fe59a53c66f1.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/a7d4e07b53e.pdfIn PDF document text
    • https://keroxazoxap.weebly.com/uploads/1/3/4/8/134884937/420f028c42c94.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/digikisovupuju.pdfIn PDF document text
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/lewuvofajilev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5fd944b7f0970.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/aa95bcca-0d73-43d2-acf0-f75d4083c32d/83957971374.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/mufolizetirezas.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/97456095854.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/gibowomula.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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 5088 bytes
SHA-256: b25dd15cf430cc1b8dac9c61d8f2564e28d9970707a7de0ccdcdc49c58164f39
font_01_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 11344 bytes
SHA-256: e556e46c10541f98a9656bf4bd8180288d95f9fecab4e521122ca192c3536f64

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