Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ad11e22f50c538…

MALICIOUS

PDF

77.3 KB Created: 2021-03-27 17:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e24bd986b6ace22aeec4d6167ae507d9 SHA-1: f3a6c1ccfc8dc230f2976c315ee0f9ed91335dc2 SHA-256: 14ad11e22f50c538680ec9c199e5bb494bf61dad4e2775c23f33f22258f7825c
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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://botokaw.ru/123?utm_term=amazing+grace+sheet+music+flute PDF link annotation
    • https://mafogidafefuzu.weebly.com/uploads/1/3/4/3/134334422/dezur_zedezubagawifas_peziximipap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_601ac319e640e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_601ac4c6eb55c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_6058db6ac0a5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462993/normal_6007c6be836cc.pdfIn PDF document text
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/gumazojutupim.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/kepalaxogiduravo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6042ef5f2fdcd.pdfIn PDF document text
    • http://gurotazejo.22web.org/kimunoloxutofexu.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/megozefil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_c3836e5cc1284ae7821a9fd932d17113.pdf?index=trueIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_c241c7e6ff01436383ed6ae8a8ba3af2.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_f353507a03904957bfca211e3de7b793.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_94f3a906e48b46bcb3ed177298bd9ebd.pdf?index=trueIn PDF document text
    • http://gagonunanu.epizy.com/71042442947.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 5336 bytes
SHA-256: 291c3600a51bcdf7d0a5d224c4373851287b3f2ecfc61cd5b27e4af83ec0f3c2
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 11268 bytes
SHA-256: 66e89c80177eb4735630f68f49b113126444f8ec2d33bd7622cc3a9317e951fa
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 16100 bytes
SHA-256: dbe3dd64dc066f428802739f18684eaf08c446fcda8cbe88d420f1ef9ee6b29b

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