Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2939ed0d31b562…

MALICIOUS

PDF

93.4 KB Created: 2021-04-05 07:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bb6d6a0c172cbd305db8ffd5250867e SHA-1: 85d8acb406ca35d3bc7d2e7c8eee89aaa58d6455 SHA-256: 1a2939ed0d31b562fec041b68783fb9ee571f1b8ed5a24c087664275f7aac327
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=interaction+in+ecosystem+worksheet
    • http://trastqort.online/bibijekujuvijamepotasibu7qss.pdf
    • https://cdn.sqhk.co/naziwixolagu/iejeshi/video_making_app_for_android_free_download.pdf
    • https://cdn.sqhk.co/kujufemom/eIjaNDS/formula_drift_ride_along.pdf
    • http://sks-expertiza.ru/33073914201ua86s.pdf
    • https://cdn.sqhk.co/xuxinugad/geBje5Z/bad_banks_movie_review.pdf
    • http://balifruit.com/what_did_muhammad_ali_tell_mike_tyson4owqn.pdf
    • http://update-win20.online/what_is_the_humanistic_theory1mqjr.pdf
    • http://quickstore.pro/hd_camera_for_android_pro_apk_1._5lvcp4.pdf
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/abb59.pdf
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/petuparenilo-lemuv-jolunabux.pdf
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/f958587231ae1f7.pdf
    • https://cdn.sqhk.co/ributexovek/SDDMijf/shelter_in_place_san_francisco_ends.pdf
    • http://arendagg.xyz/how_to_make_nuggets_crispy2pq26.pdf
    • http://azakalaza5.xyz/211056262399rsqh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_7dbe87cf740c41fba87761d60158a4b1.pdf?index=true
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_0c335f2ac20c4e63a1a6f253b26095b6.pdf?index=true
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_98f67e52a77a4ffe92814822027ca5e2.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_375075169144477cb8dbae8cde73d1e9.pdf?index=true
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_f4a881a3736242f39d6d34b217b6961e.pdf?index=true
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_b6aeddfbbfd54a699ab6c1f156c45a30.pdf?index=true
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_d3c300051b4f44978913246fcd4f9b42.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e8f.bin
4790fa008048195f293ec20b6b2ab096b23a681c197f0352fd4b60dd62a1216a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 5200 bytes
font_01_sfnt_off00014027.bin
8400f480d0d65faa0301ce02f9524c8b838131c2f6ef7db2a21294753cddc63d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14027 11840 bytes

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