Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7cbd5e88b1f1e7…

MALICIOUS

PDF

72.5 KB Created: 2021-02-16 19:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 17e4c6c23271dae57b3fc78cc9a1add1 SHA-1: 1e2ed107f4221b4d76bb19df11149ae4566e075d SHA-256: 9f7cbd5e88b1f1e7c1a81c73637da18ebd129a2fe55eca86eab10176c280a9f3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/wix?keyword=heartland+youth+rodeo+association PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453115/normal_5fd0dca8af3a8.pdfIn PDF document text
    • http://rubka.space/vazatozudotumifqfl7e.pdfIn PDF document text
    • http://intereriia.com/industry_standard_sheet_metal_fabrication_tolerancesdwg6z.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/vfjdssz/uppcl_online_bill_check_rural.pdfIn PDF document text
    • http://pet-guru.shop/gestion_financiere_d_une_pmeimk4p.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ySx2ihT/modern_sofa_design_with_price.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/6jhJibq/fawivujikikediw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5fecf1349f3cc.pdfIn PDF document text
    • http://heleogose.online/android_tutorial_for_beginners_202030qms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367642/normal_5fccc6184a2bf.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/ipIzjg7/jijetekilevozuxipemiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/luta_antimanicomial_e_reforma_psiquitrica.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/32322554154.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 5092 bytes
SHA-256: 742d7d095ec836584221b927f20ecff0b1334001f2d9c191ffbc0fea7c99d2b2
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 10832 bytes
SHA-256: c783fc08eef5735102782b72fbc091d68bd69ffb50e74a3be10d6f73395e7422

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