Malicious PDF — malware analysis report

Static analysis result for SHA-256 005afc8953a2ca8a…

MALICIOUS

PDF

85.6 KB Created: 2021-03-24 17:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cdec24f36a390d00335d76f814e47fa6 SHA-1: b971fc3443def618145358c51431a02cbe52cc86 SHA-256: 005afc8953a2ca8a35e260f4cbc7febc38a6be37318d24c4f9cabb5c5e881618
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to worksheets and manuals, suggesting a lure. The embedded URLs point to suspicious domains, likely serving as phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/123?utm_term=arithmetic+and+geometric+sequences+worksheet+answer PDF link annotation
    • http://wodekenizowa.getenjoyment.net/bixofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5fefb5a47c067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_60345615e61d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_60345405dd3ef.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/2016_subaru_impreza_user_manual.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/how_wide_is_a_2000_ford_ranger_bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_60507ef0b3d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fe8a46a9d428.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/asterix_all_comics.pdfIn PDF document text
    • http://amandeepsadyora.com/pokolavabiwivikiseje40xvm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_601af4ad4a1d8.pdfIn PDF document text
    • http://nikaold.site/pelubolulibozetak1jmrh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6040fa1bc7eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_603775ee95adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc87afc3fd49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_603efb459e697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_60340534b2def.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5ffa0c7b8ecef.pdfIn PDF document text
    • http://vebuwovivulab.mygamesonline.org/fegulemeveniworonu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sipanokule.onlinewebshop.net/18153675380.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/2008_ford_escape_shifting_issues.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 5476 bytes
SHA-256: 5c2eebcfadd7bfb6d3ff83789400f173c8267ce514d2091146a1d3e04bf60651
font_01_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 11776 bytes
SHA-256: b824985a385dabf2327dbcb584401473cad28412c79bc97d9a61e8f78178db34
font_02_sfnt_off00013a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A33 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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