Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fece542ccd0371…

MALICIOUS

PDF

75.5 KB Created: 2021-03-02 04:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 99631b3141fec3d18bff22098aa5b418 SHA-1: da93fd060c6006c1d61c450f9120bf91b64a5830 SHA-256: 31fece542ccd037135f45b287bb03b040e5d832d4506ea5263a6a9ac3bef6015
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=medical+physiology+salary+uk PDF link annotation
    • http://vizojuzoninunoz.scienceontheweb.net/xitisujoruxanadatijasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_6019d50923aa4.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/adobe_premiere_pro_cs5_plugins_free.pdfIn PDF document text
    • http://cupe1.ru/circulatory_system_of_amphioxusj1nqh.pdfIn PDF document text
    • http://daliadiago.com/xujoboxat7gd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_60385823d75d2.pdfIn PDF document text
    • http://fherixq.com/xidodosivaposawipajuxejhgae.pdfIn PDF document text
    • https://vamewifajezik.weebly.com/uploads/1/3/5/2/135297159/tupuzajabuvaxifux.pdfIn PDF document text
    • http://bluebadgeapproval.com/ponniyin_selvan_characterscl7fs.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/mwHh0gh/scary_devil_ringtones_download_naa_songs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowilewegiwo.myartsonline.com/23310535940.pdfIn PDF document text
    • http://sikejilewiz.epizy.com/6997405695.pdfIn PDF document text
    • http://bufarudewigufeb.rf.gd/virolibiwimafiwuz.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/is_arc_trainer_good_for_weight_loss.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 5504 bytes
SHA-256: 267280fcf5ef8633ce25e76c21afcdf9e369f958b9ba39161ad245f67fad334c
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 11944 bytes
SHA-256: 78109bffc5c3cd0c749f9aa077a44345b61e4ec51ee62d68752c775f3b82cd73

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