Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fade3393211741…

MALICIOUS

PDF

84.2 KB Created: 2021-03-02 12:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: cbd870b33a466e77cb07a98d5b35df79 SHA-1: 705be892555d26ab579ebdd0c9522190b13aa41d SHA-256: a3fade339321174135fcb39a3d0d6c4b077411ae265718dd281d9224f6f4273d
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a PDF link farm, which is a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or serving a malicious payload. The presence of multiple unknown reputation URLs further supports this assessment.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=writer+of+wizard+of+oz+book PDF link annotation
    • https://cdn.sqhk.co/sowojusawepu/tAjbujI/xezopudederubowedubavinaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_60127c968b566.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/XqNS89P/4340480871.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/Mghqgcl/56117771891.pdfIn PDF document text
    • https://wilubiluzitewi.weebly.com/uploads/1/3/1/4/131413550/3572333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5feb750ccc329.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/jinabisura/advantages_of_internet_in_education.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/jofewitariwedop.pdfIn PDF document text
    • http://jetetejev.rf.gd/batman_the_killing_joke_castellano.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/xorowogalujewubix.pdfIn PDF document text
    • http://zufejudo.epizy.com/aladdin_monitor_4._71.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/78324185395.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/pisalixebufufo.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/sonipobonekamevemibixefop.pdfIn PDF document text
    • http://vakusidoler.epizy.com/guild_wars_2_class_choosing_guide.pdfIn PDF document text
    • http://zudugib.epizy.com/what_kind_of_anesthesia_is_used_for_laparoscopic_surgery.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_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 5052 bytes
SHA-256: 24a610f2171cdc56101f2bfc5f429e82c4b4af4038c134d55c9a6835b8151bbb
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 11080 bytes
SHA-256: f2c3b0e044fc86ddcc8168d6ee733bbc0b80dfeb3c53c564501c1c9f37509c82

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