Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7771a5165015b2f…

MALICIOUS

PDF

65.7 KB Created: 2021-02-11 21:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0230baf6f73ac193cbcd4e68d6dc532a SHA-1: dacb35a1170a922038a569c64cbf3a65a6a9360c SHA-256: d7771a5165015b2fc32a7a292a257a717db555985bf2c94569737a14e4c68507
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=microsoft+office+apk+download+free PDF link annotation
    • http://latuha.com/wegilasoresotanuovtk3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_600cfb84f0126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff3372581450.pdfIn PDF document text
    • http://vinuporabomod.iblogger.org/26754471485.pdfIn PDF document text
    • http://vezagoxutejoza.66ghz.com/blockchain_technology_in_real_estate.pdfIn PDF document text
    • http://macsk.space/santrock_essentials_of_lifespan_development49xos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5ffe6bcd60562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5fd792c199555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siparedobapu.rf.gd/gavotte_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/95449224765.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/all_bollywood_songs_lyrics.pdfIn PDF document text
    • http://zewupubo.rf.gd/73129824191.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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 5312 bytes
SHA-256: 8353a374f17771dfaf8b7f72173cb87975be2103007060e3f750e5ec366489c4
font_01_sfnt_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 10228 bytes
SHA-256: fe6229b92518309a31cd96db1ed348a87f11c67b6908b9e75e2e0c640833e5b6

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