Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7c12059cf8fe95…

MALICIOUS

PDF

82.8 KB Created: 2021-04-06 13:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af4326315d5572512408339cbe7f5d13 SHA-1: 75a52b6a7ddb6a6f5917bc3505018d2966d958fd SHA-256: da7c12059cf8fe953bfd0f39b037a535c846404940ca4c3f229a78e3ea4fcd39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external links, with one specifically targeting a search query for sheet music, suggesting a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous links on disposable hosting points towards a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=ballade+pour+adeline+piano+sheet+free+pdf PDF link annotation
    • http://pepirizibizedel.22web.org/dauntless_game_pc.pdfIn PDF document text
    • http://rewita.fun/bernina_1090_bobbins23nxq.pdfIn PDF document text
    • http://vilofanasupa.iblogger.org/banking_chronicle_magazine_2020.pdfIn PDF document text
    • http://mists.space/bodujimewikotusepomuj90uyu.pdfIn PDF document text
    • http://drnextact.xyz/molokirino8k9t6.pdfIn PDF document text
    • http://wirufebo.22web.org/bulekiviwozagew.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/jjvxJji/taripibojofefokaximisozok.pdfIn PDF document text
    • https://cdn.sqhk.co/vakinebavun/jaKjcjb/tomibufiberavame.pdfIn PDF document text
    • https://cdn.sqhk.co/rufivobu/jmijoP2/bendy_nightmare_run_free.pdfIn PDF document text
    • http://thrivewebs.com/93411186049qa3cm.pdfIn PDF document text
    • http://erogan-columbia.site/91830885018t850x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zobadobu.epizy.com/is_wd_my_cloud_a_nas.pdfIn PDF document text
    • http://volulel.rf.gd/98415251046.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/atlassian_confluence_create_page_template.pdfIn PDF document text
    • http://lununobasafino.rf.gd/hp_laserjet_1020_plus_printer_driver_for_ubuntu_18.04.pdfIn PDF document text
    • http://bafigajunafolen.rf.gd/acceptance_sampling_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3ebdc8-1915-49f2-b97a-0d694f907a3c/defefajuxemosepafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0a20d2-57c5-40a4-883b-050d24a309da/area_compound_shapes_worksheet_answer_key_math_aids.pdfIn PDF document text
    • http://nuzijerasa.epizy.com/how_to_remove_cd_stuck_in_bose_wave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e174795-868a-4ab8-899b-dfeeb9d766a4/computer_hardware_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/47483121734.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_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 5180 bytes
SHA-256: 95a522631e75c9c7dee3af05a4ad80fb9ecc03ca9f798486f9555baa363c9340
font_01_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 12140 bytes
SHA-256: 4447c2d48e63dca88d4d4cc3f4c47fe6921198faea4f71424fca16478168b60f

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