Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da4d1f3c2e3444a…

MALICIOUS

PDF

67.8 KB Created: 2021-03-18 07:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 01faf91f279a04d50d94c7c5f28dc1dd SHA-1: ff667abd58eda6e19f941d9566a320207b4eee08 SHA-256: 8da4d1f3c2e3444abca012466e476955144cf6f00b4d0a95906091336edbe1e4
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'golowaki.ru', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, appears to reference 'linear programming worksheet algebra 2', suggesting a lure to entice users to click the malicious link.

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://golowaki.ru/wix?keyword=linear+programming+worksheet+algebra+2 PDF link annotation
    • https://cdn.sqhk.co/duvetezoje/dghjjhc/against_zombies_and_monsters_novel.pdfIn PDF document text
    • http://dofoten.22web.org/star_trek_voyager_cast_neelix.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/JifihiC/telijat.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/kxuhfhd/togax.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/gqDhcjf/71300554108.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/hib5Tgd/xiwiwuwolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/49021535236.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/kugafetisesojasemumuf.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_fb188a3afa0d4028beaed2346e697975.pdf?index=trueIn PDF document text
    • http://nokudumufax.rf.gd/gesezajivepebotamiwaj.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_4a65a9a74b114e149366a511bd1570f4.pdf?index=trueIn PDF document text
    • http://somejawugo.rf.gd/nice_templates_for_google_slides.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/how_long_do_mini_dv_tapes_last.pdfIn PDF document text
    • http://takikixak.rf.gd/nimopajigerawakuvakitod.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_68c3e75115644fbc95a2ebeb2bcbb450.pdf?index=trueIn PDF document text
    • http://kovawasokagi.epizy.com/73466631457.pdfIn PDF document text
    • http://xuvawesap.epizy.com/star_wars_movie_quiz_questions_and_answers.pdfIn PDF document text
    • http://dipijiz.epizy.com/nosepuxibud.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/how_to_troubleshoot_a_mobile_home_furnace.pdfIn PDF document text
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_49cc45783de74c57bddbf146ac374189.pdf?index=trueIn 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_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 5604 bytes
SHA-256: fdd95d985bb83269c31d08d7429cdeacd182ce11936c1fbf1e7481e0d8eee201
font_01_sfnt_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 10892 bytes
SHA-256: 42593848cdb5503c61edcad6c47aec3c8d87ce7219f3b841de5349ea017bb0a9

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