Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83f1fdb6518ae82…

MALICIOUS

PDF

92.2 KB Created: 2021-07-14 08:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ca9254d6d0924a35cb9c7251c9f202d SHA-1: d6261e8800d66a1b3c7b4067e2cdd9b24b3fac0d SHA-256: c83f1fdb6518ae823353688b80d1e62759f7ca02e509d4a9f0e0e6ba157dd291
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by both a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further stages. No scripts were extracted, but the overall detection points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://feedproxy.google.com/~r/razvivatel/yapz/~3/kVSxLQpkboc/square?utm_term=how+long+is+walking+pneumonia+contagious+after+starting+antibiotics
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8c201cff58014d54340c/1626115104405/xexaxumowatovowobudimo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecd37039a35620adcd160d/1626133360756/3_variable_calculator.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e912642dabf2723553be5c/1625887332459/what_is_the_sin_of_pride.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ede12280caa629c1dc7e67/1626202402315/gokeneguzinukesuraxoto.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee514486aa876280bdf302/1626231108520/mumagevarawufupogurasepup.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92147d354a5e86a41832/1626116628710/36996745829.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7da95c244202458ae03b/1626111402041/on_the_top_side.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed5386c439f8287163ac68/1626166150654/siwiv.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ede728ebcbe27d0c7ec972/1626203945064/nezotudofekukujim.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://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_off0001052b.bin
a2b75d62e2d44e0af24133ed352a693da5fea2534669dd21e4e2290144091a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 16984 bytes
font_01_sfnt_off000131ae.bin
a78d81a13be18111aa3b666c361c08b29de99094124ed7a5c37ae364ab9a56b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 11232 bytes
font_02_sfnt_off00014bd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 16792 bytes

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