Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd6882525afef9b…

MALICIOUS

PDF

73.4 KB Created: 2021-02-26 05:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9dc442f674eea1cfc6bdbc753f78d8f0 SHA-1: 4ab54a3d6624d82beb7c6395d44b8d6af854b593 SHA-256: ddd6882525afef9b3a58be3b2bf397c5104e3735f63d9d05f9cef94057f465ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a Honda pressure washer, suggesting a lure to disguise the malicious links.

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://leonvi.ru/123?utm_term=honda+pressure+washer+pump+oil+leak PDF link annotation
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/76daea370871.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/tufunetudanegagasu.pdfIn PDF document text
    • http://affilateapp.online/5497902199iy0ck.pdfIn PDF document text
    • http://detonic-buy.website/ladovufokuxofozakipozewyqugc.pdfIn PDF document text
    • http://golden-charm.ru/intermediate_algebra_for_college_students_6th_edition_freed00xh.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/internal_audit_jobs_in_south_africa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_602ede9ca9245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419623/normal_5fe143af17838.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/xalitotexifimerotumini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_601af1ef3fe8e.pdfIn PDF document text
    • http://digovin.getenjoyment.net/rinogagezomik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bogeguva/zedovukelugidexunew.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/62945229216.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/billboard_top_100_hits_1970.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/fisalip.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/51927701997.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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 5316 bytes
SHA-256: af921a2ecc186123f91f35ac98b7b6275b78b6383cb362bb676b8ab1fa2aa533
font_01_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 11340 bytes
SHA-256: af681d155b85d637e8d5d015c5108a9898c43d18131e389195a667d74ddbc6f1

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