Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a8c206e45022be…

MALICIOUS

PDF

74.6 KB Created: 2021-03-14 09:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5f48517d999b1031596808d1ccd94e6b SHA-1: d9e3ea09bd8d94ae58c93b3e0a081d82635546dd SHA-256: 75a8c206e45022beefaba568bda3c5be0af2200c0cffb9ec8bf781e3f85168ae
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, with a high-risk heuristic indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to an admission form, directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/award?keyword=aiou+b.+ed+admission+form+pdf PDF link annotation
    • http://jerunuju.mypressonline.com/rocket_stove_mass_heater_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/vozumolajaw/TytwQQ3/kanto_yu6_speakers_review.pdfIn PDF document text
    • https://cdn.sqhk.co/naxopesareg/HLjdXCa/bapibe.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/how_to_play_blackbird_on_guitar_taby95be.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/Ohiwp6z/king_s_raid_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/rgjDjhf/international_day_calendar_october.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/ihE5ggc/chhota_bheem_speed_racing_game_free.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/18752187936.pdfIn PDF document text
    • http://mareson.getenjoyment.net/new_american_bible_catholic_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/xatimonixu/du4SWig/mr_bean_cartoon_theme_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuvegox/jigg5gi/28391498964.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/dHLxhb4/bomep.pdfIn PDF document text
    • http://electriccannoz.club/877741891179cg1i.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/fghKiek/silkie_chickens_for_sale_houston.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujebik.atwebpages.com/66118498221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a918bb2-d427-4156-b95c-a76c707389cc/kabojaxaduxisonaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f0a093-21d0-4e38-bf92-768f22b95be1/pezisubiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab8e2c1-1c9f-4094-b00c-5ceb5e67bb47/ariston_margherita_2000_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ae585c-1701-43e2-9f0f-b1a3abfe0a72/46955481471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf643db-47d4-447c-97cf-efd7efac7d08/wiregekazawivamoloxexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3410348-e142-44f7-aa97-1c19f3d6b04f/840787108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15475ccc-db1e-4d8a-9bfd-4e0b6cc5320c/dadotadelorabegunavixej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7a2da2-6e1d-431f-97c4-184d97e6ce5b/16350947667.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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 5316 bytes
SHA-256: 1aa91bcb5c7cc839cf4b78e24c3f16098d5a758dc17f46e231cf79de81a011dd
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10768 bytes
SHA-256: 9c9be7385dc77e9db54cb797f6659c4495a09c5c9860b525defc6a87e18c4e0b