Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3a60ec38a2b815…

MALICIOUS

PDF

70.1 KB Created: 2021-02-27 05:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 983d4cb3ccc2179cf1ec7f94218613e7 SHA-1: 7c927d389b5a663e6d29deb930e786d3fa474867 SHA-256: cd3a60ec38a2b81587bccf7023d1c9c5f4bf5ca3a7f51204eb0a19298ecd0dcf
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary one pointing to 'https://lozipotod.ru/strik?utm_term=what+is+a+peoplesoft+id', suggesting a lure to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the document as a link farm hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=what+is+a+peoplesoft+id PDF link annotation
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/f59117dbdf407.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416787/normal_6004fc0a98414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5ffce5cb65b10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_602c769e6c925.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/jewofupexuk-dijej-vujusaserafejan-wasitog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455886/normal_600eaf3cd97af.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/kisuvotemo-rovoxevixavixej-lujepejaku.pdfIn PDF document text
    • http://opssmall.space/nujilapubowovajemudecohd.pdfIn PDF document text
    • https://padobijitoxu.weebly.com/uploads/1/3/1/0/131070591/5dc965eeecd2e54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ffa514b7fe14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_5fe89cb37bb96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxajetolalet.epizy.com/kadamban_songs_mass.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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 5044 bytes
SHA-256: 98b766c57243757e35e9e75d10dc1ae613f4543808d14ef92ec1bb5050a66158
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10408 bytes
SHA-256: b932850cf8b7d957020778da8f39213401647aa9f76ebebb47a95ffaf56b9ecb

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