Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19896d0985628ba…

MALICIOUS

PDF

74.9 KB Created: 2021-01-22 20:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1e5251adb98e5b58b4053bf8e7b1ba SHA-1: ecf9dfa95fbec736054a3589f39453d3b29384d6 SHA-256: e19896d0985628bae03d5def39dc86d8fecd7f6f3350d63a9dbe1ffc254b9f78
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to potentially malicious or deceptive content, possibly involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=computer+fundamentals+and+applications+valencia
    • https://porukugo.weebly.com/uploads/1/3/1/3/131380087/videdadajefisobena.pdf
    • https://cdn-cms.f-static.net/uploads/4448323/normal_5fd9adb4efb06.pdf
    • https://cdn.sqhk.co/tuvameboroke/iibied1/93355901473.pdf
    • https://cdn-cms.f-static.net/uploads/4488102/normal_5fe6b50b3d066.pdf
    • https://cdn.sqhk.co/lafugafeniki/gGhdgYd/london_vacation_travel_guide_youtube.pdf
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/nutivonevu_sokifab_laripetes.pdf
    • https://cdn.sqhk.co/xarepunekifa/oihzuhc/jidajebomebokevelumabab.pdf
    • https://cdn.sqhk.co/tajelezoja/iMjhgeC/ball_holen_hausfriedensbruch.pdf
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5fd28239bd6ec.pdf
    • https://site-1177364.mozfiles.com/files/1177364/69876644591.pdf
    • https://cdn.sqhk.co/detaludolef/hcmZgdk/idle_hotel_tycoon_money_cheat.pdf
    • https://foxuveguba.weebly.com/uploads/1/3/5/2/135297813/9320255.pdf
    • https://site-1180648.mozfiles.com/files/1180648/aqualife_3d_pc.pdf
    • https://cdn.sqhk.co/milevatomog/fjiYjdG/nejiwekabatusexo.pdf
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/1448857.pdf
    • https://cdn.sqhk.co/mamevugixej/e0eKloR/affirmative_action_programs_examples.pdf
    • https://tekebuzegox.weebly.com/uploads/1/3/0/8/130814382/talolelizuj.pdf
    • https://site-1176547.mozfiles.com/files/1176547/87323594097.pdf
    • https://cdn.sqhk.co/bitizulokiva/8hcger3/taravibi.pdf
    • https://site-1171526.mozfiles.com/files/1171526/cafe_games_online_facebook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bifamomove/information_system_objective_questions_and_answers.pdf
    • https://s3.amazonaws.com/bezegoluzose/miya_bhai_song_pagalworld_video.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_off0000e854.bin
1abc096c90b29f81e953b16a2f72284a808b7217508dc8607e9a43426269391d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 5264 bytes
font_01_sfnt_off0000fa28.bin
1e0645711271a3f810f4bdc953cd2d63c745f2c6bf6b70915afa0f21c1ce7ac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10548 bytes

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