Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fb9f81cac7b86e…

MALICIOUS

PDF

82.3 KB Created: 2021-03-21 21:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a59c597876c2af7637aabea39c6ccb28 SHA-1: d5b30ce00f15d98684b9d38a52580c4d1b9f1101 SHA-256: 25fb9f81cac7b86e2043a486fcc3cef845be7a219b8b6c27fc309439edf8e002
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 URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains keywords related to academic deadlines, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://seumenha.ru/wix?keyword=iclr+2020+workshop+deadline
    • http://my-credit.info/wolf_of_wall_street_quoteszqnk6.pdf
    • http://ampinternational.org/xefedofizezjav.pdf
    • https://cdn.sqhk.co/leporolino/9ohhuic/sadufaba.pdf
    • https://cdn.sqhk.co/zubejavaxuvu/hf3uopX/ruririzujasijimu.pdf
    • https://cdn.sqhk.co/jobubexivex/pkR8wih/overcoming_obstacles_quotes_and_sayings.pdf
    • http://teachost.com/maxavegoguriwominukidufe73j3u.pdf
    • http://skidki-day.store/how_to_reset_ematic_digital_converter_boxw2iml.pdf
    • http://verifybadgesbusiness.com/juice_bar_training_manual2ltv0.pdf
    • https://cdn.sqhk.co/faroziwe/ichcSFG/vanerepaxepeba.pdf
    • https://cdn.sqhk.co/togodawexu/giundyW/59470646965.pdf
    • http://indir-kazan.com/char_broil_infrared_grill_grates_cleaningyxfkb.pdf
    • http://irisca.online/pokofipumalowidefofawofz5xmx.pdf
    • http://instacopyrightcenter.com/xesivepatakgut2.pdf
    • http://kismyketio.com/95648274346n5xzt.pdf
    • http://muladus.22web.org/51000285245.pdf
    • http://xukewatamom.22web.org/structured_interview_of_reported_symptoms_manual.pdf
    • http://faketikus.22web.org/entresto_package_insert.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xoxemofunox.epizy.com/can_you_replace_a_magnetron.pdf
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_1f05eb7fd84a4687876c9dd11c87072d.pdf?index=true
    • https://s3.amazonaws.com/kuxegu/what_countries_have_50_shades_of_grey_on_netflix.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_1f1fa52364e345ca9bf002826b2543f2.pdf?index=true
    • http://bezopebadutaz.rf.gd/easl_guidelines_nafld_2018.pdf
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_e9279fb4f79f4886b08a2f36e70b20a5.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_80279ce6a0f949ec8773d60bed2f5ff5.pdf?index=true
    • https://s3.amazonaws.com/kavalukato/malformaciones_congenitas_cardiacas_ppt.pdf
    • https://s3.amazonaws.com/wurivuve/42998083719.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44b.bin
bce84300f3cfe37a3c479df2bbb5ac569dfe7a9378957bbd00c7f1f9587a13d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 5236 bytes
font_01_sfnt_off00010604.bin
cae43d956820230a9375f607a5c37f234ac548ada6bbf0374857ac5befedf4aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 11608 bytes
font_02_sfnt_off00012d27.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 4324 bytes

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