Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ab8082a727ad0d…

MALICIOUS

PDF

72.7 KB Created: 2020-11-20 09:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a4c3f2062025031ff91aad24175dfed SHA-1: d4df4e06ba35ddbbfaf0bb2a094a92514727f54d SHA-256: e5ab8082a727ad0d97f47335b429c4bf27bf8204c1adc30932af7efae006c4cb
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with several pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://trafffi.ru/123?utm_term=the+greatest+salesman+in+the+world+10+scrolls
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5fa45e3c7609d.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdf
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/lodadanigago.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f9cb8139a4fe.pdf
    • https://mudekireziwafa.weebly.com/uploads/1/3/4/7/134730614/nokaxefupitiku.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7007845.pdf
    • https://cdn-cms.f-static.net/uploads/4469852/normal_5fadd4df8f617.pdf
    • https://nipogoloduvi.weebly.com/uploads/1/3/4/3/134368022/duwovarufowoburora.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d69afa75-2784-43c5-8f33-57907cc7493b/11746721190.pdf
    • https://uploads.strikinglycdn.com/files/4e45dbac-4ae3-45d0-8c43-483c5ac782fc/6698936855.pdf
    • https://s3.amazonaws.com/gitipelut/memphis_weather_today_tornado.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfa.bin
e83851a26ea8837db5d7f34bf8a2671f24fbfb67688b10119d7f39340b7ac7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 5588 bytes
font_01_sfnt_off0000f0e7.bin
980cc0ae27f4a559253e352085f33a75d810302922793a8c08e90fcddae3a361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10880 bytes

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