Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a16625d7315e96…

MALICIOUS

PDF

94.3 KB Created: 2021-03-16 16:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 378106e2d5a245bd4e2cefce56dc512f SHA-1: f2354700106fbfee3c0d217b58a6da02691dfc6b SHA-256: 98a16625d7315e96370959060b06aaf0cf126c013d25cb61adc84ef3702a6281
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, consistent with a link farm or SEO manipulation scheme. The presence of external URIs and the nature of the heuristics suggest the document is intended to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9394

Heuristics 6

  • 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 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://jottigo.ru/award?keyword=active+learning+cooperation+in+the+college+classroom+pdf PDF link annotation
    • http://tonerinkstore.com/grade_7_math_word_problems_with_solutions0ijtm.pdfIn PDF document text
    • https://cdn.sqhk.co/dixobiwi/ghKjhxu/work_cited_journal_article_mla_format.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/jgiiiNx/zukofujibewo.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/8Cidoii/60708733656.pdfIn PDF document text
    • http://winefesa.22web.org/nitekerozavu.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/FCogjj2/11865366102.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/bancassurance_regulations_2020.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/speedbit_video_accelerator_activation_code_keygen.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/i5kfifw/branson_guide_top_things_to_do_near.pdfIn PDF document text
    • http://beamorem.com/cost_of_casio_edifice_wr100m0pil8.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/hbIjjhh/mazerimorumi.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/how_to_set_up_homeworx_digital_converter_box.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/java_swing_gui_programming.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_4027f1db4f3a444786ebdfab5024d8d7.pdf?index=trueIn PDF document text
    • http://masagofoxinupad.rf.gd/55270743592.pdfIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_75a968c948fc4d89b1c41a04ed54c889.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_8a9654066f5e46988ed5d26ca19b26dc.pdf?index=trueIn 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_off00013c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 5620 bytes
SHA-256: e99d0cadc25b96b4e79de3b6930089ed224eb54d32c60b84f3e0eb9664fe8d72
font_01_sfnt_off00014f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7C 11100 bytes
SHA-256: 98beecf8d76b4993869d7cb1b11732fb5d136d228450ec39f515a48f25bb2430

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