Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d8435d03f9403…

MALICIOUS

PDF

81.0 KB Created: 2021-04-01 18:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b2f8c03b5064c5a3a1f7450a93a0530 SHA-1: 829947e880c541e10e90e8d1ecac28944f9404bf SHA-256: cb5d8435d03f9403c162f7b2f423299def2774f0e3dde585a45e8e099425d895
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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.
  • 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/123?utm_term=boatman+capital+report+babcock PDF link annotation
    • https://rawowoxok.weebly.com/uploads/1/3/4/3/134309987/zuxeboru.pdfIn PDF document text
    • http://submonster.xyz/246850504382rgzo.pdfIn PDF document text
    • https://folimigoti.weebly.com/uploads/1/3/4/8/134873615/gokuremiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_605a37d2ec7d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_602c58931283c.pdfIn PDF document text
    • http://fazupefejivujuf.iblogger.org/neonatal_sepsis_diagnosis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_603235df739ab.pdfIn PDF document text
    • https://detawokigar.weebly.com/uploads/1/3/1/4/131453745/3489800.pdfIn PDF document text
    • http://fatogotem.22web.org/18460494311.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/rozevinejazef_zokadafo_bofek_kobegekelit.pdfIn PDF document text
    • https://koxawobe.weebly.com/uploads/1/3/4/5/134528326/reweme.pdfIn PDF document text
    • http://beautysale.site/35207552503qdejo.pdfIn PDF document text
    • http://003-center.ru/interview_with_the_vampire_audiobook4aho5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_ef9c31fdbb1041049a345cabeaf4a738.pdf?index=trueIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_7cb1250dfa6144e6a827da480a908992.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_6f56668a2c1d4aec85efa73e45b1f0c2.pdf?index=trueIn PDF document text
    • http://tadidej.rf.gd/zukotami.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_0c890dc20ca04e35990299edbb095b12.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_2279a38d64bb488caf9dc6a383f026ef.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_e683e2f773674938ab248430e5831028.pdf?index=trueIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_611af629fbb0456da938bfd04e56ea2d.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_1c975a0270b84d4798c136cf0e734193.pdf?index=trueIn PDF document text
    • http://bojuzafi.rf.gd/how_to_program_bose_remote_to_directv_box.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/javinodulu.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_e1cf497d322646869b813dcb1f8a4129.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_92350c29fd4945ec891abc940a90cd85.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_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 5156 bytes
SHA-256: 18625a1d1a24f3da925bea0143ce5047284a0415dc98619d6ea163a4bdc477b2
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 13624 bytes
SHA-256: 0456601eb11007381091d272becd22687ffea2271ef39c70461a80a8b0d01f0c