Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b0a8e0a0b48b59…

MALICIOUS

PDF

77.2 KB Created: 2021-03-09 13:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 99f66b0ee0e6583bd43ccdc9447787fe SHA-1: 73fbb3e0eab260f7f010790ad7b093ef4750f12e SHA-256: 62b0a8e0a0b48b594e518429047a2fd74b49f639c74dc562ca736283d3d1e9c8
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The embedded URL points to a domain that appears to be used for phishing or malware distribution, disguised as interview questions. No scripts were extracted, but the PDF structure and external links suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=best+interview+questions+to+ask+hourly+employees PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365620/normal_601fafa5b53c1.pdfIn PDF document text
    • http://bufovapafiwew.22web.org/wekok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_600bcf404173b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fe977e1a45b5.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/jhcjacj/fantasy_battles_vs_age_of_sigmar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_603098efa1462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_6010b2fa57284.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/gibiaAF/7082333654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sopikakerozobud.epizy.com/tolazimuva.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_49ec5c5e9a3b484f9a572a21704c2f3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/how_do_you_know_if_my_watch_is_waterproof.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_8c0f26fa4af149e9bb5a954b58e8400b.pdf?index=trueIn PDF document text
    • http://xakafof.rf.gd/pugizanuxakufazip.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_be77189d76624f8bbda5f980f39985d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/annual_general_meeting_template.pdfIn PDF document text
    • http://gakuzefesax.rf.gd/subtraction_of_dissimilar_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/jinekerufasavev.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/staar_essay_planning_sheet.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_02d83ff0dfc2459f87cc2623459a9edc.pdf?index=trueIn PDF document text
    • http://nujovelu.rf.gd/45417337413.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_ba5974e6daa34534aef6f549af919a42.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_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 5552 bytes
SHA-256: b151e93f16002aee825998c4fe23ad3d74a59e1395c21b2ec0a276ef22c69fbc
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10012 bytes
SHA-256: e7638b55163fe01928079157c453c6933169320528521cbec90f637f7c5e05fe

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