Malicious PDF — malware analysis report

Static analysis result for SHA-256 33765b55a874539f…

MALICIOUS

PDF

70.5 KB Created: 2021-01-05 04:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8a4380b14bafb985b16cdf36d5ef2a45 SHA-1: e71069bfe0a7bf1adc02a7fe6282fd6afae1a5e3 SHA-256: 33765b55a874539f8fc9cd537394bfbfa75cb71150afe3353aa7b0ee7678186e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting it is part of a link farm designed to redirect users. The primary URL, 'https://trafffe.ru/aws?utm_term=mail+address+format+care+of', indicates a potential phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support its malicious nature.

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://trafffe.ru/aws?utm_term=mail+address+format+care+of PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5fc34c4bad9a9.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/paputufi-dimowuxu-motufus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5fb3d1a67b442.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/bb978a9ab9aa18.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/0bc3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5fa4e9b20f245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366022/normal_5feb7ee85b56d.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/vipigenedufefe-kifoxu-sopogok-zisosiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fdb97223809b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazovosugev/bharat_ratna_award_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cd7359-c0f8-4ec0-afa5-3efc474de87d/plan_de_sauvegarde_de_l_emploi_exemp.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 4852 bytes
SHA-256: 955a660db381b9aeb1c223cfb5ab4d3c56d34e4fd3fc654eb755d57de41ab80d
font_01_sfnt_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 9980 bytes
SHA-256: fa77a719d40a55221ab19f4ab2fa9ac07d84cdc9da30629f3f2007b974d1aef8
font_02_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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