Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3f5d57786b8dcd…

MALICIOUS

PDF

73.3 KB Created: 2021-03-19 10:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49a89442eac4fdf255cc6146a56bf0bd SHA-1: e4534f67403e11275db5344eecd650f5260dcd3e SHA-256: ab3f5d57786b8dcdf8549fec23831af316ffb9c70071fa3c0d9b78504b00ed28
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious or SEO-spam related content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, likely for further payload delivery or credential harvesting.

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://botokaw.ru/award?keyword=bolt+nut+and+washer+size+chart+pdf
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/jedelipaj.pdf
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/929be13fef26c90.pdf
    • https://cdn.sqhk.co/pumopivosoba/OHBhbgg/kigag.pdf
    • https://cdn.sqhk.co/pobumepova/ictTRih/34891285969.pdf
    • http://wamimexololiwam.iblogger.org/dyson_ball_animal_2_upright_vacuum_for_pet_hair.pdf
    • https://tifefosejamixin.weebly.com/uploads/1/3/4/3/134370351/5c770dd24087ea5.pdf
    • https://cdn.sqhk.co/gaxomawelej/hAKDnq2/xuruwenotirilegalevok.pdf
    • https://xifasojole.weebly.com/uploads/1/3/0/8/130873801/wixeripa_wadamuribeli_buwuzuv.pdf
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/1752416.pdf
    • https://cdn.sqhk.co/wofikubid/OUijjgi/bingo_games_online_free_no_registration.pdf
    • https://cdn.sqhk.co/fapolokid/3LxibpS/6944087470.pdf
    • https://cdn.sqhk.co/zururodi/bsSibhb/server_rack_cabinet_sizes.pdf
    • https://cdn.sqhk.co/nodewanase/d0jjghV/46900381003.pdf
    • https://cdn.sqhk.co/silinetufid/jcJggiq/80424983920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30735436-a95a-4aea-b7da-90b207a620f3/bupokepaxi.pdf
    • https://uploads.strikinglycdn.com/files/0360538c-38ee-4f7a-a161-170e35724042/rawol.pdf
    • http://kakoxiji.rf.gd/verbos_en_ingles_iguales_en_todos_los_tiempos.pdf
    • https://s3.amazonaws.com/tufujifinobiro/how_do_you_test_cranial_nerve_9_and_10.pdf
    • https://s3.amazonaws.com/pasutiz/chevrolet_captiva_2012_manual.pdf
    • https://uploads.strikinglycdn.com/files/e9807df0-c0c1-46ce-8669-6b48dab3a5ce/what_kind_of_cream_does_dunkin_donuts_use_in_iced_coffee.pdf
    • https://uploads.strikinglycdn.com/files/60c83110-2ada-440e-9c52-2d0b97df8393/resistance_tube_workout_routine.pdf
    • https://uploads.strikinglycdn.com/files/858ac15a-cecc-48bb-8181-41f90749a13e/femusujoga.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_off0000e008.bin
f29c33bc39c2be5f4d61b101d121252a5897b8b1d731896ea1ae9277e92e0f22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 5432 bytes
font_01_sfnt_off0000f29e.bin
84af9ec6738a5ddf585000674e7bba323d6422482414071c6ff51d0ad08547e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 10872 bytes