Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaf5e8e09ccbd07…

MALICIOUS

PDF

71.9 KB Created: 2021-06-13 02:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 739b4729d48907eb68de3273cc0f1134 SHA-1: 66b2f3d0b479503e2e4f01f29e7dbc60eb3f465d SHA-256: acaf5e8e09ccbd07b4a412a15a1ca050ba3d3b054748ed2fd03daef5cf82f39c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to 'oniceh.ru', suggesting a phishing lure related to financial accounting materials. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/pbw?utm_term=financial+and+managerial+accounting+16th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5ff2615f687d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_6004006b6f9fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_603a6f60ed8fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_603c7ac822ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481291/normal_606c9b93846d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_6049691fb8aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456676/normal_5fdd3bd37c643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funesut.pbworks.com/f/childs_play_1_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbe29ed-199e-4d8e-b656-a750dd6381d2/92711023338.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/my_hero_academia_season_4_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece549ac-050a-479c-9310-7d78d5b265ee/wopud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417da79f-a186-4d66-a8ba-5a7c1a34b5f4/how_to_work_out_how_many_calories_in_homemade_food.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144483360/zesekidovoxid.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/145081653/xoxumifoxifatajoz.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/w/file/fetch/144621729/denotation_and_connotation_grade_5.pdfIn PDF document text
    • http://ketejar.pbworks.com/w/file/fetch/144840156/25720434204.pdfIn PDF document text
    • http://xovelezid.pbworks.com/f/the_epic_fail_of_arturo_zamora_questions.pdfIn PDF document text
    • http://kosubufegu.pbworks.com/w/file/fetch/144678984/46620532365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bec3994-f067-4d80-b250-58d98bb14af3/body_for_life_womens_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985cac2f-8a1c-4182-9d39-c7b76c0f291b/intermediate_algebra_problems_aops.pdfIn PDF document text
    • http://ritijix.pbworks.com/w/file/fetch/144529539/which_penny_stocks_to_buy_today_in_india.pdfIn PDF document text
    • http://tosuvop.pbworks.com/w/file/fetch/144717408/how_to_check_ac_pressure_with_manifold_gauges.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/how_to_remove_ice_and_water_dispenser_on_kenmore_refrigerator.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/deep_focus_citizen_kane.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144656469/coin_master_hack_apk_ios_download_2021.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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 5336 bytes
SHA-256: 3ed4c3775b8d36c47f5e64e68c6eadc4d117f16e6fbd91fc85fab6f98e75a56c
font_01_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 10620 bytes
SHA-256: 24600b8129be4ab356244300d4adbd32ada25295328ea7ca5e603b523943722d