Malicious PDF — malware analysis report

Static analysis result for SHA-256 af828c36bd322cc6…

MALICIOUS

PDF

75.7 KB Created: 2021-03-09 05:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ed32fbca13173c0e2bcb52461652fda SHA-1: 826ec1de47c0ba857c1715b16aa3ec65faf53bac SHA-256: af828c36bd322cc63835b5eb035fb682398ddb6fae604b7c857232c4b61432b1
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this document is likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=maya+angelou+quotes+still+i+rise PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425487/normal_5fe9ee16d055b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_602977b3c5c14.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/2013_dodge_avenger_starter_problems.pdfIn PDF document text
    • http://dedevolopi.iblogger.org/pegegidirev.pdfIn PDF document text
    • https://rinuxusopav.weebly.com/uploads/1/3/4/6/134679155/nudid.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/susarizebamar_limuvifamosim_wugafe.pdfIn PDF document text
    • http://proita.space/the_certified_six_sigma_yellow_belt_handbook_2nd_editionjs70k.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/enthalpy_of_formation_using_hesss_law_lab.pdfIn PDF document text
    • http://hookup668.site/aruanas_1_temporada9p2n6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_600473625e214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd83b2742258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_6007e34f39029.pdfIn PDF document text
    • https://nemerode.weebly.com/uploads/1/3/0/7/130775229/5187361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_603dc38a60a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5fcf46974dabb.pdfIn PDF document text
    • http://wosedumuf.mywebcommunity.org/47980902155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxupuxud.myartsonline.com/58108703117.pdfIn PDF document text
    • http://pitigapevede.onlinewebshop.net/days_of_the_week_flashcards_printable.pdfIn PDF document text
    • http://sipopos.epizy.com/android_developer_auto_update_app.pdfIn PDF document text
    • http://tovujopojat.epizy.com/7262234610.pdfIn PDF document text
    • http://pexoxusipatesu.epizy.com/66097572439.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_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 5084 bytes
SHA-256: ecdfcb7011078d5af8fdb22479accc83cfa0590215a53e39825a9325293d4b2e
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 10432 bytes
SHA-256: e0d234d8de6992324e95c4efe3bbbdcae61282225b14a65562fc18d253efbc15

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