Malicious PDF — malware analysis report

Static analysis result for SHA-256 da198346d9fcb68e…

MALICIOUS

PDF

85.5 KB Created: 2021-04-05 09:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 716c08fcf02fc6b7157acda1d004176a SHA-1: d992812e1d489f4b868cb70ae040df8a5e56bbe7 SHA-256: da198346d9fcb68eb7a45418c4f8e7bcffe03ec4850731227166ac8ef8e8fb44
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and a link farm heuristic strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/aws?utm_term=asus+rt-ac87u+ac2400 PDF link annotation
    • http://helplnstagram-confirm.com/why_wont_my_new_dell_computer_turn_on569vd.pdfIn PDF document text
    • http://nebo-baikala.ru/scarlett_2i2_pricer9rjc.pdfIn PDF document text
    • http://vololagabedopi.22web.org/fifikor.pdfIn PDF document text
    • http://yourbigdick.space/chown_form_telstra_consumer_to_consumer904ct.pdfIn PDF document text
    • http://pay-order.info/dovumebibejikefopife3g1mw.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/ig8ib4I/38318754511.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/wjchaii/game_room_spectator_chairs.pdfIn PDF document text
    • http://uanews.website/91465225055uqt9f.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/dvjblgd/94900894753.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/h5hgRjb/monster_hunter_vr_ps4.pdfIn PDF document text
    • http://kernig.pro/bhojpuri_video_song_dj_mp4b0m8q.pdfIn PDF document text
    • http://xupoluwifokolo.22web.org/48164956712.pdfIn PDF document text
    • http://jumbochecker.com/kuzofonobofejixefoxoguymhdj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaredekol.epizy.com/antiinflamatorios_nao_esteroides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09cd7d0-5d55-4a21-a5c3-e82c4cb7f59e/arduino_ide_windows_xp_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299a5698-3ee3-42a6-aace-ebd39359c9e4/89028183090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a4302a-664e-4c30-84b6-b4268143020e/breadman_panini_maker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc13b670-d440-4cd4-8fe2-83be68d15f3b/sibogodiwolerakoxeboxor.pdfIn PDF document text
    • http://gelisufaw.rf.gd/sopixijixafez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b31d180-ec45-48a8-acc3-78afc298a1fb/fundamental_analysis_and_technical_analysis_ppt.pdfIn PDF document text
    • http://tesapul.epizy.com/visual_evoked_potential.pdfIn PDF document text
    • http://fuzariwa.rf.gd/dafuma.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_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 5420 bytes
SHA-256: 98f91027d036a6e7c54680796882d197a1f97059507fb8322ad0b385fb21345f
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 12740 bytes
SHA-256: 24d38292df5b29ea810179be0be29c58d511a3cad1dc4c8e7e735c3a735cfebf

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