Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f552066aea2e50…

MALICIOUS

PDF

76.2 KB Created: 2021-01-11 19:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8310bd47ac3bd8fe5a527f71129ec538 SHA-1: 71c0f772bec04eb511c0c9ad8c5fcbdf024b9526 SHA-256: 77f552066aea2e5016a1b7c9dc97d61e6624c6ba6df177da545a3e69f37789e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the true destination by using disposable hosting and redirectors. The presence of multiple unknown reputation URLs suggests a phishing or malware distribution attempt.

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://traffset.ru/aws?utm_term=annapurna+circuit+trip+report PDF link annotation
    • https://site-1168346.mozfiles.com/files/1168346/12681049931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f889b356655a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fd6866d40bd5.pdfIn PDF document text
    • https://site-1083588.mozfiles.com/files/1083588/descargar_terapia_intensiva_sati.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/aghi3jc/buttons_the_musical_dvd_download.pdfIn PDF document text
    • https://site-1173660.mozfiles.com/files/1173660/98562637260.pdfIn PDF document text
    • https://site-1180062.mozfiles.com/files/1180062/background_hd_1080p_free.pdfIn PDF document text
    • https://site-1173572.mozfiles.com/files/1173572/female_movie_stars_then_and_now.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_5fb6e6269005f.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/roware/goxal.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/tutagekuxugow.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 4588 bytes
SHA-256: 22764cb5b81c73af926893e4e949335f5a192a0d882c32128d348cc64528cc14
font_01_sfnt_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 10884 bytes
SHA-256: 849c070bd723022c8f1f8d410023781dceff2101bac82d674fd93850c26ea009
font_02_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.