Malicious PDF — malware analysis report

Static analysis result for SHA-256 81410c6d1286fd8e…

MALICIOUS

PDF

72.9 KB Created: 2021-03-20 00:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b651a6642268946ace6df1cc75c3171d SHA-1: ea3d1fd7a3b9cd7e89d6228a452509c7b578cbda SHA-256: 81410c6d1286fd8eebb3a9230feca416219da9d6963537c45bb80dd23ef327d9
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs and a heuristic firing for a link farm, suggesting an attempt to redirect users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=goblin+slayer+light+novel+vol+6+pdf PDF link annotation
    • https://cdn.sqhk.co/parabeset/ihfhcka/adopt_save_a_life.pdfIn PDF document text
    • http://rajedat.iblogger.org/father_of_the_year_parents_guide_2018.pdfIn PDF document text
    • http://ooovseanalizi.ru/washington_state_covid_numbers_by_countylsv8s.pdfIn PDF document text
    • http://whalesqpa.fun/calculations_using_significant_figures_worksheety1wo0.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/hfjhJif/td_bank_locations_ithaca_ny.pdfIn PDF document text
    • http://metazoaapc.fun/bovarupetowimesitakakasij9lt6x.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/UifhLgg/like_app_video_player_download.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/fadufafabofawu.pdfIn PDF document text
    • http://summ-green.fun/how_to_replace_schlage_lockus3ix.pdfIn PDF document text
    • http://zabunugakope.22web.org/pibujuxogaduke.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/vowevizugux.pdfIn PDF document text
    • http://mopovigegof.22web.org/easy_punctuation_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gametusepezuka.rf.gd/39707176791.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/18084525854.pdfIn PDF document text
    • http://wowijikozo.epizy.com/reinforced_concrete_designers_handbook_10th.pdfIn PDF document text
    • http://zividovapajawuv.epizy.com/mausam_ki_barish_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/salicylic_acid_for_smelly_feet.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_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 5788 bytes
SHA-256: 40968a98b14c0b1111cd6ae01e640e06e7865a8ef77e1ce3253651a21ac8658e
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 10704 bytes
SHA-256: 51534aa994ec3ffe731d17e6ae73e99b9a5559e8138ced736f62a309546e9b43

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