Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7bdb6590acc780…

MALICIOUS

PDF

68.2 KB Created: 2021-06-08 18:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe8001ac129f64b7fa056aa4d8d151b8 SHA-1: 11985798a91374bd55e7d972b53adb6079e88d8f SHA-256: 8e7bdb6590acc780ebb0af14d0787a7f320419f49f61fdd61712bfe21277553c
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://medvor.ru/pbw?utm_term=my+mp3+songs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475391/normal_5fcd7180a4c77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463529/normal_5ff8a4c85cc1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_605c869d13e0a.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/vazudekub_lojumejanuw_wofafuzeli_nukevi.pdfIn PDF document text
    • https://linusakeziri.weebly.com/uploads/1/3/4/7/134747074/6263627.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/nesodikeziko.pdfIn PDF document text
    • https://kitujimozudek.weebly.com/uploads/1/3/4/3/134375735/kitedizobubava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_6066906d07d77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5fc86c6aee247.pdfIn PDF document text
    • https://tuzulenoj.weebly.com/uploads/1/3/4/8/134866727/840238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejufavo.pbworks.com/f/why_do_the_poor_get_poorer_and_the_rich_get_richer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b4babb-a1ed-4f88-bd49-448ec886f33c/what_was_the_main_decision_that_came_from_the_insular_cases.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/naxariru.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144780264/how_to_adjust_idle_speed_on_evinrude_outboard.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/30537102554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1abedffb-6fea-40dd-9672-3c622178974e/asme_b16_34_download.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/tecknet_x366_ultra-slim_backlit_bluetooth_keyboard_manual.pdfIn PDF document text
    • http://nadisizaze.pbworks.com/w/file/fetch/144701904/how_to_win_chess_in_2_steps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec969f5-6de3-4964-a791-ba473d5b912f/bosch_nexxt_500_plus_series_dryer_manual.pdfIn PDF document text
    • http://wasazejis.pbworks.com/f/zagorekawima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00169e52-ce00-464a-b1fb-74518eb1227f/is_olivia_and_nick_from_jerseylicious_still_together.pdfIn PDF document text
    • http://lakiluxodev.pbworks.com/f/how_to_mix_reef_salt.pdfIn PDF document text
    • http://xefobukeza.pbworks.com/f/tizefepaxulisofowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3185daf6-3f69-4bd3-a1b5-de67befa35c3/7712587669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44873313-b836-43fd-a043-df130cd8fdc2/human_genetics_concepts_and_applications_by_ricki_lewis.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_off0000d1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 5072 bytes
SHA-256: 69ad092ba049bec624a3d9c98c5ee62697a6cb6d815f2d1037c006cd3cbe853b
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 9368 bytes
SHA-256: f76984441e2c94f3fe23b8688d5e822471583b82cea29d90ebcad7fc8d848c73