Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed13aac8ed0b3bb5…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 22:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8b0afedd52198032be40a770002b9524 SHA-1: d91d6c90b85977e374cd23f794527fc51a6a3f5e SHA-256: ed13aac8ed0b3bb51f5b078e28d0bda3efd953d21b3dfec41e7a0d8cf57ec34c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=romeo+and+juliet+act+4+scene+1+lesson PDF link annotation
    • https://teraxawazolazov.weebly.com/uploads/1/3/4/3/134386914/zomalixoxi-zibobunejor-somuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5fcbbe15d220b.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/vunowuwexuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fed5d2b211f1.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/witebojadezeperanutokak.pdfIn PDF document text
    • https://xilemizafijoso.weebly.com/uploads/1/3/4/4/134483217/7984860.pdfIn PDF document text
    • https://zubikuzo.weebly.com/uploads/1/3/1/4/131453486/mitibomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_5fd9d30f2feda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381738/normal_5ffd295a5529b.pdfIn PDF document text
    • https://sozazisoxiz.weebly.com/uploads/1/3/4/4/134463449/4fb069966f.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/voxovexizemupekegoju.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/runakokaparunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_60316adcd6731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e79c482-45ce-4656-8685-9315e676ea03/17314910913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93788d9b-5f25-4e7a-b67d-f927a68dfbe7/how_to_make_a_healthy_protein_bowl.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/wowuxoverazotoxiwomoli.pdfIn PDF document text
    • http://girofili.myartsonline.com/zasamijarorado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d80e94c-e4f8-4ad3-bed1-36dfab42762a/87739739680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d609aa4b-75a6-4ea0-b6fe-395dead5c7f0/wahl_clipper_kit_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e900ab-2c6e-4c2d-b6a1-818e9d14b0a4/boxagi.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/agile_software_requirements_download.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_cae4f01c287141a185f44260eb5b9e6c.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_89541055606c479eb7063848b3d68210.pdf?index=trueIn 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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5212 bytes
SHA-256: c37ac8ffc3f2793aee14f58205223194598eee99b6d1a3a11fd8ff2fd0a10662
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 11300 bytes
SHA-256: 38b58f788ffb6a46fb1e224de238c051f781c43fd6d167e0635325e2622c4a0a