Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5eae99837467848…

MALICIOUS

PDF

81.5 KB Created: 2021-07-16 01:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2f3fdc71748dfc896f6eaa1471656fc SHA-1: 3617c7484b8fda6d2b3c4562fbefd24981b3e506 SHA-256: c5eae99837467848a230d153f6058b721ef48bfc755e69dce327e683eb9ba7ab
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded URLs suggests a phishing or malware distribution scheme, likely leveraging a spearphishing attachment vector. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall indicators point to a malicious PDF designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/AG-UZpNbJGc/square?utm_term=meaning+of+the+word+decisive
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee28c18685745b7d13784f/1626220737880/10480891802.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e832b3dbb92d34f5b22221/1625830067761/simple_donation_letter_sample.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e820a748fdc2594043c66d/1625825447265/jedos.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0080c96309e3685ab2234/1626343436911/muweberakupatewa.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed99abdfc7900eec31fe58/1626184107942/mekanagolanuv.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede4124ff81d3e2814dcc5/1626203154447/arcade_shooting_game_with_pedal.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edba3ecd7e9b4eaed7f0d1/1626192446385/jinifa.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee3329aa539923b585acfd/1626223401312/allwell_member_services.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edbc1ca777f115ab917a8a/1626192924410/in_admiration_of.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e88327ef140d799693f171/1625850663802/93798662858.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee63582ee8b51fd937bd58/1626235736978/2580608111.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_off0000dd72.bin
aac8bc61eac05296ada40f1a5fc0a157dbfcfcb693dc7ee390100d1052ddb0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10856 bytes
font_01_sfnt_off0000f653.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 16792 bytes
font_02_sfnt_off00010e65.bin
da8a9a50977074a1dc88cc717ada211c8e24e657624c3597f67885043db5caf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 16808 bytes

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