Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d139cdcb0fc7650…

MALICIOUS

PDF

77.5 KB Created: 2021-06-08 19:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fa880a717fcfee1485a3ece5b05e2448 SHA-1: 143492c347d74ca45db961764c241cd7baead407 SHA-256: 0d139cdcb0fc765012c551fcfd424ae41b2fdc3df2f841b9136589fc33f66a95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=yandex+image+er PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6030242774bb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_600469239d253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_600f4fe84cbcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutoteja.pbworks.com/f/kafexizom.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/nogizukegupojakep.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144444162/misedasusifimegudapew.pdfIn PDF document text
    • http://sowenux.pbworks.com/f/asphalt_8_all_cars_unlocked_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e68fb2-9a9b-436c-8457-3ebaed5dc686/92717138095.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144597603/12577038932.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144472479/64118533610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89898ed-a773-4580-b23b-c6e8ce3aa7c0/vamavakikadaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2669501-c1fb-4e0e-ac69-7bef9c713af6/vezomexupuxudajosimukunup.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/best_parking_simulator_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb62c38-a429-4722-b884-0af42bc6a83f/43401661158.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144412371/jujakotugofopusabewa.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/what_is_the_meaning_of_platypelloid_pelvis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f43941-0b50-42fe-802e-ea12927fd9eb/why_is_my_fisher_and_paykel_fridge_leaking_water.pdfIn PDF document text
    • http://mutoteja.pbworks.com/f/cooking_demonstration_speech_outline_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a091de-9655-45d9-a73c-84a4a30e78b5/38675575364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59caa8a5-07ad-4949-bab8-8e56d4204e74/10190288057.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/96974142082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6d0991-c6cf-4879-93dd-c05b9bb67b4d/abbyy_finereader_15_crack_free_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629239f8-5c63-41a1-8263-bc20c0cde2cb/how_many_carbs_and_calories_in_a_taco_bell_bean_burrito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83392d7e-a14c-406b-aa45-2af2694b78c7/what_is_the_tone_of_your_singing_voice.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_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 4964 bytes
SHA-256: 4cd040debbcd587d87ea598a645500539de7573844ff256b03f0f42aaee7ae27
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16532 bytes
SHA-256: 6e6f3a7685a69ce63d541b30bfd64d80f1284ab1afc364263fa1d651811ad2b6