Malicious PDF — malware analysis report

Static analysis result for SHA-256 e784798a7ea35bf7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 01:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ca428a692859af7294669272750c9da SHA-1: dc8aec6095f533c39ab8f8a45a719720f111e917 SHA-256: e784798a7ea35bf717220405eb61479576eea168cae64693a94ce72eb715ef0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to a suspected link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to an 'application form', aligning with phishing or malware distribution tactics. The presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=altinbas+university+application+form
    • https://cdn.sqhk.co/zuxosutuku/hbid6Ly/battle_royale_3d_warrior63_apk_home.pdf
    • http://3203epworthcres.com/tokamupeds2w.pdf
    • https://cdn-cms.f-static.net/uploads/4381344/normal_602d35539bdb6.pdf
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f592e7b33.pdf
    • http://znasila.ru/403972528691auq2.pdf
    • http://snapchat-alert.com/apostrophe_worksheet_second_grade4jjzh.pdf
    • https://cdn.sqhk.co/wanevakaxuma/jejdiKp/black_and_white_pictures_of_basketball_players.pdf
    • https://static.s123-cdn-static.com/uploads/4371509/normal_5febb13f24118.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_6031ed80d94be.pdf
    • http://jolixasij.sportsontheweb.net/bebop_scales_piano.pdf
    • https://cdn.sqhk.co/pidodalatip/hXpggXr/11455166479.pdf
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6041a19032bce.pdf
    • https://cdn.sqhk.co/vumajotiwog/jXIgw1z/hedgehog_dilemma_piano_sheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jujadodedaruxix/76547295393.pdf
    • https://s3.amazonaws.com/gogunabones/steam_cs_go_problem.pdf
    • https://s3.amazonaws.com/waduzirader/wotekokimo.pdf
    • https://s3.amazonaws.com/tubukeganuji/alessia_cara_moana_song.pdf
    • https://s3.amazonaws.com/muvojugejoxip/how_to_bring_brother_printer_back_online.pdf
    • http://nunavaxukozu.onlinewebshop.net/is_blood_glucose_monitor_accurate.pdf
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_56cbc7a5afef4d11ac189c3a653e2bfc.pdf?index=true
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_9853f071a07748d0beb3c09a7489d99e.pdf?index=true
    • http://jutagejefutix.atwebpages.com/35038925568.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_5d76217c27f649f58e8d4451a95209ca.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64d.bin
f461914d79406d01c95aec9b34dc5526e2ff9089741582bee92b28e678d939b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 5452 bytes
font_01_sfnt_off0000f8d2.bin
4eaa3b7571d78f40150169448285593dc063fb28a021085745d2be18c8d9636b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10772 bytes

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