Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22057c8c033fa6a…

MALICIOUS

PDF

84.4 KB Created: 2021-04-05 10:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3ebb9b5505436be9807e72e9b98f11 SHA-1: 288d66e04fa15ba94ab672fb49fdbc6744a73e3c SHA-256: a22057c8c033fa6a1b4445580b0dc99e38427dd474bcdca3c09d8bf055d90b48
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=hampton+brown+edge+interactive+practice+book+level+b+answers
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fde1f6b03936.pdf
    • https://cdn-cms.f-static.net/uploads/4463266/normal_5fd68e6715de6.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6037d60a21094.pdf
    • https://static.s123-cdn-static.com/uploads/4378153/normal_6002e4fec5690.pdf
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/xusirojiziju_dorudowemijadog_lebajugoko.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/f0d85e914486a.pdf
    • https://vavinaxedekofew.weebly.com/uploads/1/3/0/9/130969509/tizifisulozugamuwudo.pdf
    • http://fupefabesosada.mygamesonline.org/39666718496.pdf
    • https://bometisuvuxop.weebly.com/uploads/1/3/4/6/134684792/totupidi_xuxivodu_regulifoxituju.pdf
    • http://lanizimugigil.getenjoyment.net/pulanoditujoborukoji.pdf
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5ffc1936e8ec4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kalanejaxutilif/bricks_breaker_puzzle_mod_apk.pdf
    • http://bumejefivoxigo.myartsonline.com/adding_and_subtracting_fractions_with_unlike_denominators.pdf
    • https://s3.amazonaws.com/loxopudizus/a_supposedly_fun_thing_ill_never_do_again_chapters.pdf
    • http://nakogis.myartsonline.com/polarity_therapy_randolph_stone.pdf
    • https://s3.amazonaws.com/dorulusof/comparative_degree_worksheet_for_grade_3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7d.bin
d078204e2ca2d798bab0d517726c3c9787bd47282c14b99cff3b80a640876ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 10504 bytes
font_01_sfnt_off0000f182.bin
249e2162fbc138956c3461655673680ffbcf0c4a425c60e8066f8c4fc3fa5703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 5708 bytes
font_02_sfnt_off000104ef.bin
cc3c58e72192563790cd5a6231e703cc3ca1b11686f3032cbffe8ace8f549345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 11896 bytes
font_03_sfnt_off00012d5a.bin
28a037052d9bfd3e1746c9661cbc5d38c3da16a319a5f155319a290b7be943ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 16476 bytes

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