Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d3821338a265bb…

MALICIOUS

PDF

78.2 KB Created: 2021-04-24 19:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4037434f6754d4e25cbadd4fdd99c21c SHA-1: 335f2a972faf4224b76aed40e0b9682e9904db75 SHA-256: b6d3821338a265bba6f6748c1a910fb99861e857e4718f6e7943ca8f19a6f3cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book downloads, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=sql+server+administration+book+pdf PDF link annotation
    • http://tupakewufitid.iblogger.org/chi_square_test_reporting_example.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/BgRhbjg/vehicle_exempt_from_odometer_reporting.pdfIn PDF document text
    • http://xuzevofut.22web.org/fiduciary_duty_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/2M7ihW5/53887603892.pdfIn PDF document text
    • http://purepivuposav.iblogger.org/comment_fusionner_deux_fichiers_sur_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/jhqTggj/weather_clock_widget_apps_for_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_c3a56ef7458f45eebc90a69bf0254934.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_c77355f76e9f4962b3884f4f12c781bb.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_8db34689892540c888b255f63c34af62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/cant_search_songs_on_apple_music.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/application_of_biocatalyst.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/injustice_gods_among_us_pc.pdfIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_acc8652d3a02445198dc491f401f6343.pdf?index=trueIn PDF document text
    • http://bovifuxabobi.epizy.com/zusit.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/dragon_s_dogma_dark_arisen_pawn_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/david_klein_organic_chemistry_3rd_edition_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/90860046646.pdfIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_0409a00baca04a2b86e2552692f80c0d.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_ee1958789d5b4dce83d823251de5bb33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/hyerle_thinking_maps.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_f560266723e64b8098c142ef8f0c3c99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/47180863710.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_9bbfeae3028d46ddbadcb24cbcd42d5d.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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 5680 bytes
SHA-256: 6c179dbcb2d1c705e330771860b98ecd88fa7bc90e4e7474c994c04d060e5eef
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 11140 bytes
SHA-256: 8dfba78652363a2846cbf74bf1c7ff4b509d95781a28a1b3903a60ae1bd15b58

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