Malicious PDF — malware analysis report

Static analysis result for SHA-256 83acf73c40d34e62…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 06:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5356ada9157c237af731ca6bfd68bac5 SHA-1: 25fa9a7ac158476caccf096893373664299f2d13 SHA-256: 83acf73c40d34e62d55d0dbae4475965d402ff372eb8a217b29bbc0c4dc9e993
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

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 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/strik?utm_term=why+can%2527t+i+update+pinterest+on+my+kindle+fire PDF link annotation
    • http://jovopomutulilo.medianewsonline.com/fujupagajub.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/8b4963738ccb.pdfIn PDF document text
    • http://vrestoran.info/tegemepujobakuvilet8ht2l.pdfIn PDF document text
    • http://krepezh.guru/the_standard_hotel_nyc_ice_skating3i7hx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_5ff9f9b197878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fe12530764dc.pdfIn PDF document text
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/7d5f2e62689365e.pdfIn PDF document text
    • https://pusenosate.weebly.com/uploads/1/3/5/3/135347115/kiwusexegexame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_6036f6b73ba4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosipasakuvil.myartsonline.com/gerefazafejivajenik.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/kudax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affa30cd-5d1d-47c4-8c21-2c21c9264408/timagexataxetupil.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/widarudanamisotofikazirok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a9f9791-f1b0-4089-bc28-dd8d56ef0079/how_much_do_entry_level_mechanical_engineers_make.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/51520237068.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/define_collective_bargaining_agreement.pdfIn PDF document text
    • http://positajugopisu.myartsonline.com/are_australian_rainbow_fish_aggressive.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 5608 bytes
SHA-256: 0fdbca2f2b8dbdc23a23704e14cc968e263cb1726fd7844817a57a58e92ec245
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 11036 bytes
SHA-256: eced328239c69d15635b72a19b223cefe506836890a5cbc4234a51a49748463d

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