Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f10ca835064ca2…

MALICIOUS

PDF

123.1 KB Created: 2021-07-14 05:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5535da7176e4bdedff91f5db1e2c6e83 SHA-1: 0ab38341b72d8d4675016ae11e76ff6f781d22de SHA-256: e3f10ca835064ca2970f0f0cbb7a3659da8990804fa98cb7a4fd5952f92b6232
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains an embedded URL that leads to a known malicious domain, and the document structure strongly suggests an advance-fee scam lure. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the lure indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ketchas.ru/square?utm_term=cotton+whigs+definition
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8ca7d596d362fd0fc5bc1/1625868925802/c1_test_3_reading_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e76f879d016f55d43e920e/1625780103816/cheat_call_of_duty_mobile_apk.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee106a2af4c01978f96b32/1626214506546/what_does_the_bible_say_about_abortion_kjv.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec816d950202184f104acf/1626112365460/mp3lio_download_free_mp3_songs.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9115478ebe26bfc68f2f/1626116373747/vemowivuf.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd786017ec663b53b98d2/1626199942846/wunifisadipilozesozin.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec921e4f2b1c51afa4ea9d/1626116638522/54239698142.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_off00018115.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18115 16792 bytes
font_01_sfnt_off0001992c.bin
97eeb6159dc687044d3a9e09d5cf6d47aca4d307e566ab93140d141c10467cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1992C 10444 bytes
font_02_sfnt_off0001b0ad.bin
1e2423cce44d22c970d8ccc27e0f22852d20fc7387e93f1112f53d145204f36d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0AD 17816 bytes

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