Malicious PDF — malware analysis report

Static analysis result for SHA-256 733f954b81449bf4…

MALICIOUS

PDF

94.8 KB Created: 2021-04-03 20:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19dd08063caa825b22cf3e274391dc62 SHA-1: 22c31ae689b4170de4a6d536aa46a12e51eb01ac SHA-256: 733f954b81449bf428bc256e102832d21e5133b07196fe5a89459e346d3a081c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the primary external links points to a URL that appears to be part of this farm. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/award?keyword=conduct+disorder+journal+pdf
    • https://cdn.sqhk.co/xeliwiwogivo/hdrTggp/my_talking_parrot_game_download.pdf
    • https://jisiresofuwidi.weebly.com/uploads/1/3/0/7/130739297/20e75bcd.pdf
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/vuwilulorixo.pdf
    • https://cdn.sqhk.co/tifapoxur/I6Wghjb/modern_age_rpg_enemies_and_allies.pdf
    • https://cdn.sqhk.co/xinefegepe/Ohd6jiS/android_mobile_screen_recorder_with_audio.pdf
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/aa2557d391d523.pdf
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/5558039.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2683958-2b0c-421f-91ca-06e6e6b1ce00/diary_of_a_wimpy_kid_tv_show_disney_plus.pdf
    • https://uploads.strikinglycdn.com/files/590dc6b3-b06e-4720-bb4b-b7134d9cfad3/exam_cram_comptia_a_220-901_and_220-902.pdf
    • https://s3.amazonaws.com/pegek/pcb_design_rules.pdf
    • https://s3.amazonaws.com/muvazi/zawiwuzokidovizizo.pdf
    • https://s3.amazonaws.com/gazivemon/pukegimuwomavajixetidabew.pdf
    • http://bexinoj.epizy.com/kidnap_2019_bengali_full_movie_720p.pdf
    • https://s3.amazonaws.com/wufujudisu/72087793141.pdf
    • http://savagit.rf.gd/vuvafukuvisekireminorik.pdf
    • http://lujisuwebofuro.epizy.com/xiginez.pdf
    • https://s3.amazonaws.com/fedojigudaj/lateral_thinking_riddles_with_answers.pdf
    • http://wiwekire.epizy.com/new_product_blueprinting.pdf
    • https://s3.amazonaws.com/wozowuledij/kerowovolodatafegalibuxen.pdf
    • https://s3.amazonaws.com/pafexegud/does_sex_during_menstruation_cause_cervical_cancer.pdf
    • http://marakolin.epizy.com/juwudogatepepugenenipisus.pdf
    • https://s3.amazonaws.com/mexijegedakol/places_to_drop_off_old_clothes_near_me.pdf
    • https://uploads.strikinglycdn.com/files/913b55f0-7f1d-40d3-9ee5-86daeef50f68/50_most_common_phrasal_verbs.pdf
    • https://uploads.strikinglycdn.com/files/48698f33-f45c-498d-ba68-2ae69b0afae7/jepozukomarazutibir.pdf
    • 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_off000133b6.bin
56b7347d445e62e0bcae2509aebea23525e4ac0c3258c83aa96102f080930d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 5132 bytes
font_01_sfnt_off0001453b.bin
098b311363a7aeb6937861a2863c15f5fdc34a9cf52acc14ffc3e459fcdaf9d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1453B 11940 bytes

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