Malicious PDF — malware analysis report

Static analysis result for SHA-256 868a98d6a4de0c91…

MALICIOUS

PDF

81.2 KB Created: 2021-03-21 03:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecaac0c7fc27fa315d277c82d909052a SHA-1: 82fbbc4bf14413c2cc2897a00c2f4ab258aca3b7 SHA-256: 868a98d6a4de0c91c21788104c02301a5bc251a8a847fbf21269dc26b30c226c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further indicate maliciousness, classifying it as a 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external links points towards a phishing or content-serving attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=brexit+deal+summary+pdf
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/6e50bb.pdf
    • https://static.s123-cdn-static.com/uploads/4420448/normal_5fee864f11865.pdf
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/7949750.pdf
    • https://static.s123-cdn-static.com/uploads/4402247/normal_600307177a889.pdf
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/pimuno.pdf
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/ritejerugor.pdf
    • https://cdn-cms.f-static.net/uploads/4387571/normal_60137c5f01d9f.pdf
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/2879757.pdf
    • https://cdn.sqhk.co/jigitovewuk/ifzMhbS/nemegiwerito.pdf
    • https://cdn-cms.f-static.net/uploads/4414175/normal_5fd6f0aea67bc.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_602fd50ac7cd8.pdf
    • https://cdn-cms.f-static.net/uploads/4412896/normal_60354e7bbf0e2.pdf
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/4538768.pdf
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/4dd32.pdf
    • https://puvugopusu.weebly.com/uploads/1/3/2/7/132711965/5f2aa20664.pdf
    • https://cdn.sqhk.co/wetotuluxe/iiifhjb/jizelozisabup.pdf
    • https://cdn-cms.f-static.net/uploads/4448718/normal_6020c24cd7528.pdf
    • https://cdn-cms.f-static.net/uploads/4379855/normal_6028fa81ba9f9.pdf
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/sufubebixe-suwatese-jupotuwiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_ce32f44cf2634ffeb7d4bfe18a71e478.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_54327ca54b5946cabd623625a9f9db2c.pdf?index=true
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_b14724592dad4421946edcd661818f94.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f361.bin
4a530c74094f81e8c8d3910277c872023cd90fea02eb8a09813a7378559dcc10
pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 5072 bytes
font_01_sfnt_off000104af.bin
68e41df0d9f4250ce730c446a83f9757f0e7365f244296950915c040188ec6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 10808 bytes
font_02_sfnt_off0001295a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 4324 bytes