Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d0d77067b9b632…

MALICIOUS

PDF

81.0 KB Created: 2021-03-25 07:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9255ff94844de4eed48fc61478037ba SHA-1: 21a38facd6a6d761f6067e06e443ccfb617d7546 SHA-256: c4d0d77067b9b63247d6a78d725b19167060aa92a9e181957a9ed6cf89896603
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to a suspicious domain, likely a phishing site disguised as an academic resource. The document body, though heavily obfuscated, suggests a lure related to 'atomic structure and theory worksheet answer key', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://dafemum.ru/wix?keyword=atomic+structure+and+theory+worksheet+answer+key
    • http://gutufozif.iblogger.org/advantages_and_disadvantages_of_internet_mobile_phones_social_networking_wikipedia.pdf
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5fe9a95eaba80.pdf
    • http://shopwithsale.website/31253578820mvruy.pdf
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5feb2a45439f0.pdf
    • http://pubgmobiie.com/5377120669719aev.pdf
    • https://cdn.sqhk.co/biluvetizom/iblmhih/xevajafoxasifagaresobam.pdf
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/2213724.pdf
    • https://kofudoraf.weebly.com/uploads/1/3/4/7/134716635/levonuw-xovizeteke-dosezifenoxux.pdf
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5ffec07ad70a8.pdf
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/vewal-rotik.pdf
    • http://yachts-4-sale.com/gajebidorogelejerabifnjs6m.pdf
    • https://cdn-cms.f-static.net/uploads/4485162/normal_5fd75dfa76d86.pdf
    • https://cdn.sqhk.co/nitunoda/iNMgJL1/firewall_protection_software_free.pdf
    • http://zupinuxuxodu.iblogger.org/basic_calculus_grade_11_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4474449/normal_602fec0bcddbd.pdf
    • https://cdn.sqhk.co/kagaxavog/mhekKvI/condado_puerto_rico_condos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sakaburepagase/what_does_f02_mean.pdf
    • http://gerubetez.rf.gd/dixex.pdf
    • http://mebexadesojixip.rf.gd/dd_spellsword_build.pdf
    • https://s3.amazonaws.com/bisute/duwumikofik.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_off0000ea3d.bin
ec26182e5c94862978667b336a85476a6843a4fb5eaf99d98727ed343e532250		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 5396 bytes
font_01_sfnt_off0000fc7d.bin
5fba210f90cd547108424bf79c27903cb8fb8534d146ad0b46edf2299aa86f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10708 bytes
font_02_sfnt_off00012176.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 16092 bytes

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