Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cda1ef295022993…

MALICIOUS

PDF

82.0 KB Created: 2021-01-03 16:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8ecaf2dd479c4cae0642370839601307 SHA-1: 61ef5d9179b14c1c21bcd0c5337f1b637f90f27b SHA-256: 1cda1ef2950229937a5779dc12603644e71552c79db8bd0ec4818a316ae8b0e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'ad posting jobs online' in the document body further supports a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=ad+posting+jobs+online PDF link annotation
    • https://cdn.sqhk.co/wirowanorax/YigwQ5G/shooter_cast_season_1_episode_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fa5d3bd9fdf6.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/dSidqgj/stellar_password_recovery_for_outlook_crack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fee1926355fa.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/c4hijjS/61656540627.pdfIn PDF document text
    • https://jibajupo.weebly.com/uploads/1/3/1/6/131636806/nakoketewuk.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/bUjfMTe/jagovavulonesapis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461481/normal_5fc810e076819.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/kemedonabepeleno.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/wetubojuvefovugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f91df19855b7.pdfIn PDF document text
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/pokagar-kerobutisarav.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/jomadewem_tagugaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 5024 bytes
SHA-256: bc8e513a7d646a258b390b648a802cbb2a29e6536e55b3880ac76fabc19cf736
font_01_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 10980 bytes
SHA-256: 01f750c2150e348cdc4fcded0335974315196fd569306b951801fbb029453de4

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