Malicious PDF — malware analysis report

Static analysis result for SHA-256 842bd890fb719bad…

MALICIOUS

PDF

73.9 KB Created: 2021-03-31 07:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 79e8639963fff5e46201ed39b381386f SHA-1: 26cfcb997a2d0c62e12e161d2eb7fbe3c0494aad SHA-256: 842bd890fb719badfb1e6bc255f1db635bb98ee28219adfd245249e740f71cd5
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an external URI pointing to 'baarspo.ru', which is likely part of a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host multiple links on disposable domains, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=bromelina+abacaxi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382420/normal_600fbe642265b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_5fe68ae4ba8b7.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/AjjheXQ/rare_blood_type_rh_negative.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_601b1a6b201b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448538/normal_5fe26af708821.pdfIn PDF document text
    • http://figedizizexi.22web.org/alamo_cafe_nutrition_information.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/hyG7aXE/battle_royale_3d_warrior63_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5fcbf3432cba4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_604ebc6de15f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5fce816726a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_60170aabad294.pdfIn PDF document text
    • http://gonosijotu.iblogger.org/why_is_my_galaxy_tab_2_not_turning_on.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/HChpPha/gaxaxof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekebevijizin.rf.gd/nuwokevudozomodo.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/dark_souls_2_havels_set.pdfIn PDF document text
    • http://vofofoduwegakuv.rf.gd/42195898399.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/browser_terbaik_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/garmin_handheld_gps_78sc.pdfIn PDF document text
    • http://tifilumiteva.epizy.com/christian_brother_malayalam_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/lev_grossman_the_magicians.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/applications_of_psychrophiles.pdfIn PDF document text
    • http://perabojon.rf.gd/practical_celestial_navigation.pdfIn PDF document text
    • http://pumifaxiko.rf.gd/purarafamesase.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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 5380 bytes
SHA-256: 75f53fa3c4e36d89b35107d23677246cafc70019bd061775268b056fcf93ad94
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 13040 bytes
SHA-256: 1264de97f562a7dc4efcc6ad9ab186a027010af2eb18823f9f4e300562b391de

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