Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87897d860eea0e9…

MALICIOUS

PDF

70.8 KB Created: 2021-02-19 04:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fd3d3c4852ab867161da8d59ba7348c6 SHA-1: 4d55b67d73e64a83dfd6d09243cea2e2d173f357 SHA-256: c87897d860eea0e9de4afbcce3ee14637eabfdba24b4bcbf999aaaab6e566397
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'fly tying materials for sale canada', suggesting a lure to a potentially deceptive website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=fly+tying+materials+for+sale+canada In PDF document text
    • http://siondez.ru/the_godfather_2_screenplay_download6w1jh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5ffed24b7d99e.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/sims_2_apartment_life_free.pdfIn PDF document text
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/bekuvebalaganu-lewiwuw.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/1799087.pdfIn PDF document text
    • https://razotipelemato.weebly.com/uploads/1/3/0/7/130738732/9354004.pdfIn PDF document text
    • http://mediaverifiedbadge.com/warning_letter_for_absenteeism_in_marathiuyk99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_60209cf2dd7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fe9291d9841c.pdfIn PDF document text
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/832e8659.pdfIn PDF document text
    • http://ig-copyrightnotice.com/6784012056y5gyu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_5fda38605c01a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokodejufoda.rf.gd/sifirarobetubijarese.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 5400 bytes
SHA-256: 77f9492dc4d984c48502b8d9383f9cb089c759f1804b2933436df609330b0966
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 11016 bytes
SHA-256: d20383c5257cd356f0d1562a6a77729be65a4242422e9dd889c146d495dfa06b

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