Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5eb994543679f3…

MALICIOUS

PDF

97.5 KB Created: 2021-03-21 08:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ffff86b03a31a4536de8cc168742636e SHA-1: c0aa8998eafde3dd7d8f469f2c0371a054ca5b64 SHA-256: 3e5eb994543679f3e0e16c46d0cb1e6c6136df7a01a02f4332c6ee2b80e91669
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged as a link farm. One prominent URL, 'https://golowaki.ru/123?utm_term=addison+group+submit+timesheet', suggests a phishing lure related to timesheet submission. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

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://golowaki.ru/123?utm_term=addison+group+submit+timesheet PDF link annotation
    • http://tvoeobrazovanie.fun/73389093150qudhv.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/vacuna_varicela_pediatria.pdfIn PDF document text
    • http://matizaw.mywebcommunity.org/55329956989.pdfIn PDF document text
    • http://kewotij.mypressonline.com/uverse_remote_will_not_turn_off_tv.pdfIn PDF document text
    • http://marafonsport.site/replace_keyboard_dell_latitude_e7450a6b2d.pdfIn PDF document text
    • http://ourfutures.space/kidnapped_movie_parents_guide6rm68.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/peer_gynt_in_the_hall_of_the_mountain_king_lyrics.pdfIn PDF document text
    • http://eroganoficial.site/georgia_guidestones_reduce_populationp0qlk.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/74838751310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_479269325b86451fb2f9dec2daed49b6.pdf?index=trueIn PDF document text
    • http://ruvemad.myartsonline.com/25452783652.pdfIn PDF document text
    • http://wizixiposowafid.rf.gd/11720912599.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/24504608768.pdfIn PDF document text
    • http://weboxezave.epizy.com/dudelofesosamojasigop.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_24093d3508e44596b267a4760a829d37.pdf?index=trueIn PDF document text
    • http://radikabo.rf.gd/31320566488.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/klasifikasi_afasia.pdfIn PDF document text
    • http://toxalotivip.epizy.com/36522972784.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_f944d5b6762a495e9e58c713fdc230f9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 5140 bytes
SHA-256: b9f1c603d5fbbed615ec992159c004ebf97b630147c0bd6bf3d383f7e26a9a71
font_01_sfnt_off000141ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EF 12364 bytes
SHA-256: 9289049fad87122dcfd8322e2e7e8aedae75c0b4af607f2657d37b3eda2df19b
font_02_sfnt_off00016aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AFF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3