Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e62a5cbea0b2eb…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 15:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41046da93be33561e3e83586d4b31597 SHA-1: 637859f7c7e4c6c80d95c68786e61426099d4190 SHA-256: a1e62a5cbea0b2eb3d7e091f21cc90a3f53b229b30ca40c7ffc552047b5c6425
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong intent to redirect users to potentially harmful websites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/123?utm_term=sql+format+timestamp+oracle
    • http://lnstagram-blue-badge-form.com/nora_fatehi_new_song_download_mp3_mr_jattn69b5.pdf
    • https://cdn-cms.f-static.net/uploads/4392660/normal_6020b0ffc46b8.pdf
    • http://upsbox.ru/zogixwg7ow.pdf
    • http://rawenspant.online/nagutexubabupidemoposubazgxouz.pdf
    • http://fajiriduxir.medianewsonline.com/gta_v_cheats_pc_weapons.pdf
    • http://luchdobro.site/how_to_thread_pe800z1651.pdf
    • http://twoup-viktoria.online/what_is_knowledge_workerpzelt.pdf
    • http://003-center.ru/words_that_start_with_sectywr70.pdf
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6048a33d670cd.pdf
    • http://xijogeziku.66ghz.com/bosexabuda.pdf
    • https://cdn.sqhk.co/xakatikakizi/qgxibsc/bozujikabarano.pdf
    • http://xojuxelase.medianewsonline.com/nifoneva.pdf
    • http://characduwe.space/pebinsg26t.pdf
    • https://cdn-cms.f-static.net/uploads/4380536/normal_60337b02ee538.pdf
    • https://cdn.sqhk.co/tizesefetus/Egpygd6/12349340100.pdf
    • http://trynon.xyz/dyson_big_ball_vacuum_cleaner_reviewsr981d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mowuxafidezori.epizy.com/ram_promaster_service_near_me.pdf
    • 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_off0000ff89.bin
fb3226ca50f2436d840e0206d0c05c59e4401492bc5a79cdcaf69201a69e1bb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 5388 bytes
font_01_sfnt_off000111ca.bin
aa91867ba08193496b05c5c55672d3108f6311ca7877523f62bc72bf6fa0b7c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 11220 bytes