Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc71b832a960f8c2…

MALICIOUS

PDF

89.1 KB Created: 2021-03-03 12:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb382f61c10333e406d91d4f40393952 SHA-1: 1717e755dc9c6811f899a54fec8616ee66bbb87a SHA-256: fc71b832a960f8c26e50f7eff9bf70fac4143faefe9a275e1db46cbb45534bd8
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

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://crophysi.ru/wix?keyword=equilibrium+expression+problems+%25231+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4447431/normal_602c5aedd177f.pdf
    • https://static.s123-cdn-static.com/uploads/4366628/normal_60036c6ce54c1.pdf
    • https://cdn.sqhk.co/gebitasixa/ggjaESG/flying_dragon_simulator_spacex.pdf
    • https://cdn-cms.f-static.net/uploads/4446782/normal_5fd896dd5eb30.pdf
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5ff55993f2312.pdf
    • https://cdn.sqhk.co/fuwufupi/F7Vgjbc/easy_skateboard_tricks_after_ollie.pdf
    • https://cdn-cms.f-static.net/uploads/4482424/normal_5fd77a56782ba.pdf
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fd61e9a1d8f9.pdf
    • https://static.s123-cdn-static.com/uploads/4469101/normal_5fe569d3dbf72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kisagoz/mitsubishi_electric_air_conditioners_mr_slim_manual.pdf
    • https://s3.amazonaws.com/tikoweravisixu/zovobetabafeg.pdf
    • https://s3.amazonaws.com/zoromexemuzid/how_much_does_it_cost_to_renew_your_drivers_license_in_georgia.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_off00010a77.bin
6660d952e55ba2f88a39ad4c52516a57796c37aa1e90f2b62ef6c782978fe662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 5048 bytes
font_01_sfnt_off00011b93.bin
e380339075d95e68959b120b95ff94b99b7cf3e69efbe5137f34d8e77c67d9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 11432 bytes
font_02_sfnt_off000142dd.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142DD 16060 bytes

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