Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b02b0adc4cd17d…

MALICIOUS

PDF

83.6 KB Created: 2021-03-27 18:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f574ad7643e2b0fdd31f4a61439463df SHA-1: 96c6c6768480185a941107984fba45019abc8848 SHA-256: 90b02b0adc4cd17d7bfb10e7cf364a4a22ba224ee525718019bb8225d5be3c8e
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 0.9997

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://fokemale.ru/strik?utm_term=velocity+vs+time+graph+slope+motion PDF link annotation
    • http://mebel-albero.ru/56716874370uofq5.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/viiQzvB/82485055114.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/ggWChgL/25678381959.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/gggchiV/joladuxowazi.pdfIn PDF document text
    • http://makeyourself.xyz/haz_llover_abre_puertas_cielo_acordesin8k1.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/jcrjfib/liriwiwabokesosojarik.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/BuMlgec/spastic_colon_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/a9ib4w8/99021927171.pdfIn PDF document text
    • http://all-casino.xyz/47979097338a4f0m.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/7dNidA9/farming_jobs_near_me_part_time.pdfIn PDF document text
    • http://moresukko.ru/speed_queen_fl_error8gh6s.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/W5gijbU/gameloft_gods_of_rome_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/biegghf/direct_and_indirect_speech_exercises_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/djdjcvh/liribapijilasagip.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/3hdOjjp/94702444157.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/homelite_26b_blower_carburetor_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_166eee9340c442b2b26006aa231f1de4.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_38de0e637a1b46f8879c4b3f60824871.pdf?index=trueIn PDF document text
    • http://zevusup.atwebpages.com/autosar_compendium_part_1_application_rte_free_download.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_5070e3d5667849cab151f67c4482b5a0.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 5472 bytes
SHA-256: 257b3465c9510e512936a5dcb1317f16d2e7fb33418050ae63db5aedcc2ea02f
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 10744 bytes
SHA-256: d0f6ccd5a789b47c0b25a6956956de6c1c9e54bd87da36f0ca44eeb4944cecca
font_02_sfnt_off00012bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080

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