Malicious PDF — malware analysis report

Static analysis result for SHA-256 a587436a4bf046f6…

MALICIOUS

PDF

77.2 KB Created: 2021-05-05 17:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c18e5aecb92d41bd43015eb474b541a1 SHA-1: 2cdf936178e2e84de1dfc9edb40161e7bd6311b6 SHA-256: a587436a4bf046f6a477dc13a31aabc85e061636cfddb25d07f2525d8e22ce0d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware.

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 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.
  • 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://midufefew.ru/strik?utm_term=breville+-+the+juice+fountain+cold+xl+juicer+review PDF link annotation
    • http://instasavephoto.com/28986636747m6bjz.pdfIn PDF document text
    • http://generatorsale.ru/sat_vocabulary_practice_worksheetse1axc.pdfIn PDF document text
    • http://it50save.info/how_to_use_cricut_design_space_with_expression_2jocyy.pdfIn PDF document text
    • http://dsv-trening.ru/13414158173upiy6.pdfIn PDF document text
    • http://elinekici.online/70720163026ocrg9.pdfIn PDF document text
    • http://tonilukibifed.iblogger.org/butler_model.pdfIn PDF document text
    • http://gusudula.iblogger.org/advanced_excel_2020_formula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapuguxu.rf.gd/translation_rotation_reflection_dilation_worksheet.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_10b68e44cc974e64bcd4f8f7f8114f95.pdf?index=trueIn PDF document text
    • http://gigonusotomofi.rf.gd/7781122258.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_66385555ce50414aa0a87a3b6879d825.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/3d_printing_and_additive_manufacturing.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_a0778861855346c2866e4f2bc8bb26df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/itil_v2_vs_v3_vs_v4.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/bromance_taiwanese_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/mr._coffee_steam_espresso_and_cappuccino_maker_-_bvmc-ecm17_instructions.pdfIn PDF document text
    • http://kejoluxukoso.rf.gd/wowilekuzuwaluruferubegu.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/beximuk.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/editable_wedding_invitation_templates_free_online.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 5308 bytes
SHA-256: c3a1a4542d0f1780e0308b08f5ea80130030da5505ae72a7ad613c00909e981b
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 11400 bytes
SHA-256: 063020c16cb0caebf6dfcd53c5456e9cc837be42a19bcc5cee39672493d6f8a1

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