Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a6b4b8c5b79725…

MALICIOUS

PDF

251.3 KB Created: 2021-04-03 10:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2691c7b14ddfabdc70ccff1fb5740c SHA-1: 7fdaede29312b309672ebda396ecb2ad4b30b8ef SHA-256: 89a6b4b8c5b797255e71a7cc853a027bb06404bed1496bab7ab4bcaa8b1e182e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The presence of a visual download button and password protection instructions suggests a social engineering tactic to trick the user into downloading a secondary malicious file. The embedded URL points to a suspicious domain, likely serving the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=warhammer+40k+harlequin+codex+pdf+download
    • https://cdn.sqhk.co/tisezalave/fu7iajh/h_and_m_black_dress.pdf
    • https://cdn-cms.f-static.net/uploads/4422378/normal_60278993087dc.pdf
    • https://cdn.sqhk.co/kifateten/z7jijbR/69146878841.pdf
    • https://cdn.sqhk.co/tanusulirava/dyGhegc/does_cash_converters_buy_diamond_rings.pdf
    • https://cdn.sqhk.co/lojulifuvuxu/gm6vLX5/surfboard_stack_rack.pdf
    • https://cdn.sqhk.co/sururezog/ijygfjf/zombie_sniper_evil_hunter_hack_mod_apk_download.pdf
    • https://cdn.sqhk.co/wagomito/gjfKjex/73498405058.pdf
    • https://cdn.sqhk.co/tobijoge/YnPlgiD/new_fortnite_cat_skins.pdf
    • https://cdn.sqhk.co/jifedibodo/hic395q/abiudi_all_songs.pdf
    • https://cdn-cms.f-static.net/uploads/4422377/normal_601fe609e3dcf.pdf
    • https://cdn.sqhk.co/rekewuneboxu/iex4S4B/55810220936.pdf
    • https://cdn.sqhk.co/letijefa/gNggfHk/zombie_killer_toy_gun.pdf
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fd622c887004.pdf
    • https://cdn-cms.f-static.net/uploads/4470972/normal_604db0edbf522.pdf
    • https://cdn.sqhk.co/vefomatakin/ijyoYJS/my_first_piano_adventures_christmas_book_c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_1817a37bf85842f79a3ed3e61ba967b4.pdf?index=true
    • https://63f3b980-df56-4d16-8c75-de9131d8e0d8.filesusr.com/ugd/b7fdcf_417aa6e5eef3493c986255ff567125d0.pdf?index=true
    • https://s3.amazonaws.com/sepawi/logarithmic_differentiation_worksheet_doc.pdf
    • https://s3.amazonaws.com/luxelula/aristophanes_clouds_perseus.pdf
    • https://s3.amazonaws.com/zesotat/21972808417.pdf
    • https://s3.amazonaws.com/sukobogixe/femovufowanirugetigebor.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_3c6e501bec074592b843afeafcb8c257.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_off0003a30f.bin
d34af90a2275c5b0adcd42df883484894dfc26136b0bc23d4d2742ea7ae88670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3A30F 5808 bytes
font_01_sfnt_off0003b6ca.bin
30650de70e99acbc3151b21481628fae9ca943daca6802bb5026d3dd57cb0d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B6CA 12028 bytes

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