Malicious PDF — malware analysis report

Static analysis result for SHA-256 a647560da80d33cf…

MALICIOUS

PDF

72.3 KB Created: 2021-02-28 20:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7e62ec11eeea08edff37dad1da02996f SHA-1: 0a7a88e018726455b6d97afdb8f531529585d3ed SHA-256: a647560da80d33cf79e8f075a65984854bbf00bef58260ecf18769256548d4b1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'manual download' and 'free download', indicating a lure for users seeking specific files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=acls+manual+2015+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/mafowixodi/jf9jfhg/fresh_reaper_peppers_for_sale.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/tomalotixa.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/hjujacr/wajarodusix.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/vubosuxigitesirijupojuve.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/ieigiay/rbse_solutions_for_class_10_english_notes.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/18262964878.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jJjirJq/jonemiletedurakesumadi.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/information_technology_degree_online_reddit.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/whirlpool_quiet_partner_2_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5fcc1a57147c3.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/how_to_be_more_gentlemanlike.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/jb3gggD/ice_wallpaper_and_keyboard_lone_wolf.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/classical_guitar_tabs_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_600fc56d1506d.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/cub_cadet_ltx_1050_kw_drive_belt_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rujidafedisezu.atwebpages.com/hp_laserjet_p4015n_toner_replacement.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/12754516930.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/leaving_cert_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/migukat.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/47218498979.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/pubopeg.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/format_sd_card_linux_partition_windows.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 5584 bytes
SHA-256: bdb61738e9713783103f9ccd8dce2680c38bf1faac46a04f8a44b9128c999130
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 10352 bytes
SHA-256: d59323264067e48144d6cdfd9067c61f8638b4bc39c7144d0d78a814ae8f9649
font_02_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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