Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c22c7c44d317a8…

MALICIOUS

PDF

79.3 KB Created: 2021-05-07 04:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4abef67918211289b5672ac9083cca2c SHA-1: eceaf97ee53fe9277a0f9c8097186f0010fc18d3 SHA-256: a1c22c7c44d317a8e81b7be7239ae9cf6bdf215ce60595a46dbb0c9d017e64a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the primary external links, https://jacksth.ru/strik?utm_term=roku+smart+tv+black+friday+2020, is likely the intended destination for the user, potentially leading to a phishing or malware download site.

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://jacksth.ru/strik?utm_term=roku+smart+tv+black+friday+2020 PDF link annotation
    • http://want-seo.ru/transferir_game_center_para_android6wfvi.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/bie8hcN/rolling_sky_ball_vr_fairyland.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/diaVOjM/adblocker_ultimate_browser_mod.pdfIn PDF document text
    • http://uber-global.com/digitech_rp360xp_presets_downloady2n4c.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/iiVTgca/68907979136.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/ijcWpjd/lab_equipment_unscramble_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/fNXjarb/56540575432.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/ihhjcrk/25159313676.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/iciejiQ/company_of_heroes_2_soviet_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/math_multiplication_worksheets_grade_8.pdfIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_269a1a001a564af9b0cb312ecb09e535.pdf?index=trueIn PDF document text
    • https://321e46d8-a3e9-4523-905f-b0dcd1dcb7ef.filesusr.com/ugd/29fbc3_b9c7304bda4440daa2dd890b05498a91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/video_status_wa_kartun_lucu.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/machinarium_android_walkthrough.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/80851961559.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/22755888146.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/best_nimh_rc_car_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/built_in_oven_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/mogez.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/what_does_member_of_the_clergy_do.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_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 5816 bytes
SHA-256: fc6c6dd007d7ab983ea4826d947be4aaf8a7d200fc04ab984aa6fd2670986419
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10888 bytes
SHA-256: c0394dfa4a4467058f4b7fcd290cfdcb773653dba239b549152cdad18b20487c

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