Malicious PDF — malware analysis report

Static analysis result for SHA-256 81839c3762c3e351…

MALICIOUS

PDF

82.6 KB Created: 2021-03-27 17:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c51608541af1b1e367b71d0e6174461b SHA-1: df1a2338009f6b545b1efda2302b9f24bc7bcc8e SHA-256: 81839c3762c3e3514125eafb66bdcd34f805e5f07ef08301195c5c8000c37ec2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a phishing lure related to license renewal. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=what+documents+do+i+need+for+license+renewal PDF link annotation
    • https://cdn.sqhk.co/likamigid/RYjbgiv/turn_off_keyboard_voice_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/gcejgUI/robots._io_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/bhexYbw/history_of_medieval_theatre.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/e1Gubhe/battle_boom_mod_apk_download_unlimited_gold.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/uCib3NR/mass_for_the_dead_best_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/WgjaChf/44900568597.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzozuni/aGnsggZ/dumiwemo.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/ijhs05Y/my_home_design_dreams_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/bQoR9pz/temporary_eye_color_change_drops.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/djgoRhd/81274458117.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/TfheYgb/potopifuzilasuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fff5164c-1337-4dca-a870-9ee8129e9d1f.filesusr.com/ugd/11cbe4_63459e3becb04ac3b15bfc95c7cc16d4.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_72d025addceb4dda9371efa90096361d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/figugipopar/transitions_legal_birmingham.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/alternative_minimum_tax_form_2018.pdfIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_f52a88c592254a679ba23e7f237e57c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/57347696813.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_76222fe8ba574ce4a96bc913cab90725.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/how_to_learn_chess_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/dell_t5500_cpu_upgrade.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_6db14945cf404d00b1954a67422cb59f.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_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 5368 bytes
SHA-256: b9e7edbc9348e7d708cc0f6cfa1bd4576b190bf35061c9d233ff9c618657bb28
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 11028 bytes
SHA-256: f55308c4987b2612c0aab568cbcfab99f98c2cf93e9fcad14f2a7a135708fcf7

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