Malicious PDF — malware analysis report

Static analysis result for SHA-256 b057cb562e3d2c63…

MALICIOUS

PDF

90.0 KB Created: 2021-04-08 23:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88d51ab260fd08782b899783d3f38831 SHA-1: b0e65f463a2446c0bb928ad15d16c1c4b3e8bbf9 SHA-256: b057cb562e3d2c63195f819f4951c31afcde49dbcef9aaac14b6a630b5845908
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to APA citation guidelines, suggesting a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=ejemplo+de+conclusion+normas+apa
    • http://onlinetiser.website/simple_room_booking_system_free6vroa.pdf
    • http://differencecheats.net/84529163526zj2gv.pdf
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5fdacbe17dbef.pdf
    • https://static.s123-cdn-static.com/uploads/4387417/normal_6001e26f3479c.pdf
    • http://texno3ua.com/464697580868wikh.pdf
    • http://arenaprobet.com/37505165221hpl4t.pdf
    • https://cdn-cms.f-static.net/uploads/4370288/normal_60567e6fa5392.pdf
    • http://erogan-columbia.site/best_book_on_art_of_seductiontn92h.pdf
    • http://topcreditcheck.info/32313712083ztohu.pdf
    • http://imedo.ru/lelomazoginafaretekkuxo.pdf
    • http://gratoraama.website/mapa_provincial_de_huallaga_tanager15qzl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remeranexe/1984_part_2_chapter_3_discussion_questions.pdf
    • https://s3.amazonaws.com/baxunaf/edvantage_ap_chemistry_1_answer_key.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/famemupudiwejis.pdf
    • https://s3.amazonaws.com/gogonof/sar_suspicious_activity_report_fincen.pdf
    • https://s3.amazonaws.com/widuxade/8662199794.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/vuvesufo.pdf
    • https://s3.amazonaws.com/tipikaxe/4413981397.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/king_lear_act_2_scene_2.pdf
    • https://s3.amazonaws.com/kagedatabujo/somewhere_hovering_over_indiana_sheet_music.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010715.bin
ab8907407baabf34bb1971ef6e581a301ea53a98871dccac6f7de2002d8dddd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 5252 bytes
font_01_sfnt_off000118e0.bin
a8a3aa65c083d0f8fcd259a37dbb85bbfc1f7e9ed17336b3f341b3c1f1ca9db7
pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 13104 bytes
font_02_sfnt_off0001434b.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434B 16204 bytes