Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e1729b9b0c5405…

MALICIOUS

PDF

79.3 KB Created: 2021-02-28 15:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e58cbf1993685cd35da71623079bb5fc SHA-1: 1a746f7c0e408cb59e7903ce019343bc40d2b846 SHA-256: e4e1729b9b0c5405dd15a3fa7f7343a4d7ba95c55530d225ce50bcb0c5a8b19f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm to redirect users to potentially malicious sites. While no scripts were directly extracted, the structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/wix?keyword=aiag+fmea+manual+5th+edition+ppt PDF link annotation
    • http://qwonder.space/10144343321wp8iz.pdfIn PDF document text
    • http://frukt.fun/birakowajoo43ut.pdfIn PDF document text
    • http://vovality.club/tatodolabe3k85r.pdfIn PDF document text
    • http://romeita.space/android_version_8_name_listqiiav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5ffde650bc338.pdfIn PDF document text
    • http://appletopshop.ru/81964157410bsg2q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fe8124b977e0.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/jiseba.pdfIn PDF document text
    • http://webmastervlad.ru/kitchen_wardrobe_sheets9ujkn.pdfIn PDF document text
    • http://juilopkiretlo.ru/pressure_washer_pump_replacement_honda05wcg.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/b823adf6.pdfIn PDF document text
    • http://intereriia.com/soxamemamivubin8tcn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_602c6ad798e1c.pdfIn PDF document text
    • http://arm-watch3.club/wiriv5eu8o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepipejesa.epizy.com/lorexido.pdfIn PDF document text
    • http://lewikevizuku.epizy.com/aria_triunghiului_echilateral_formule.pdfIn PDF document text
    • http://jifadeve.rf.gd/55993745752.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_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 5292 bytes
SHA-256: 4bc23b09149efcbc573032d473d76793d4b747f0bc17b90b531e8d91d57eae0e
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10636 bytes
SHA-256: c99f44be4736e05f604b3dd5d3a25ff68ee33c5c3e9de62fa038d41cb7d00c02

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