Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a88792cf50e8d49…

MALICIOUS

PDF

85.6 KB Created: 2021-03-25 09:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3cb811c16ba9f16626e9772cdeb53652 SHA-1: 9424e317a4d238956b883f0fbc6d9dfe00e39a4f SHA-256: 4a88792cf50e8d49683e2b25a05d36e6c8c4a759be2da6bbb50b04449ce88d84
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a large number of external links, including one to zajinet.ru, suggests a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate malicious intent.

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://zajinet.ru/wix?keyword=breville+bjs600xl+fountain+crush+masticating+slow+juicer+vs+omega PDF link annotation
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/gofupiwobelo-zelewepej-pavizikaborazu.pdfIn PDF document text
    • https://zanikegira.weebly.com/uploads/1/3/1/4/131437850/mariwaxenofok.pdfIn PDF document text
    • https://vatovuturok.weebly.com/uploads/1/3/1/8/131856009/4e65e681179820.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d188a0dd-8ba9-4b93-903b-2a4e62b70492/5_tibetan_rites_exercises_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/bosch_router_guide_track.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/30050949175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bba5da0-f1fc-4b86-840a-7d0b79dabb73/yamaha_v_star_1100_workshop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/cash_flow_management_for_small_business.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/b_i_f_r_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/how_to_hang_sheetrock_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5277f1-905c-4f50-9093-ea21080a0a44/100_aos_de_soledad_resumen_capitulo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/how_do_i_get_my_brother_printer_to_print_without_color_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/simplicity_vacuum_cleaner_replacement_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e2292c-7588-49b1-b371-3da15077dace/lepijigawowigometenokeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed75e9c-1536-4313-9e1d-d846bb9f0b96/who_sells_primo_water_dispensers.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/scrum_alliance_certified_scrum_master_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/how_to_dye_hair_with_la_riche_directions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/007ae6d6-a934-42bd-947a-b1e4da7b4482/pobalivugoxowujoninabax.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/13099640013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00deae9-f6b2-49bf-8158-37dfc7f97f2f/bawisojoliriwemupuw.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_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 6076 bytes
SHA-256: d17b0cd142a29dd069856857007ab9bfda784de8c699b742617c4d6ab827e040
font_01_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 11676 bytes
SHA-256: 5e1d26edeb069e43bf020bd7617eccb27d6488cd8d5b78e0d16bca65e6c5c0f0

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