Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5a87ee8bdb733e…

MALICIOUS

PDF

76.7 KB Created: 2021-07-17 09:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b29a2dd2e0caa9cb9df4339fbbbd73e9 SHA-1: be0558621947af439efc1db0f63301e4a4fdc318 SHA-256: 1c5a87ee8bdb733e555ddca284f93173c12f9fdb4e08c39e0003806b0d99d002
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document contains multiple embedded URLs, one of which is a Google feedproxy URL that leads to a benign Squarespace PDF. The presence of embedded URLs and the overall detection suggest a phishing attempt or a lure to a malicious site, likely delivered as a spearphishing attachment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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/IdU8rIDf9lQ/square?utm_term=how+to+clean+candle+containers
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f03a2f96309e3685adfa93/1626356272049/so_tired_today.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1e16fa1e7405f456c1077/1626464624098/votudo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0e3abb348e55d1c4e0015/1626399659674/output_voltage_equation_of_cycloconverter.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f09dcabe235f3a2c55a1be/1626381771022/xtreme_go_carting.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e93ffe2a6f785f583557e7/1625899006083/kuludewopiso.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8075aa431ed42d2fda578/1625818970791/how_to_make_a_paper_wand.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e810279ebc0053f3189102/1625821223752/55973790373.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee5f7cb1dcdf258da9eb5a/1626234748920/80948281835.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7696d856bf3314cc7f7f6/1625778541330/direct_and_inverse_proportion_word_problems_worksheet_grade_6.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_off0000cae1.bin
8ecdf49283780fe29852aa4d51a48bbb8e2297e1aac443486ec5b1fee75b3bb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 10440 bytes
font_01_sfnt_off0000e2a9.bin
b9c5358c05ec89a02c638996c430bd57039eeae556344f4d432cb8d354d494fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16968 bytes
font_02_sfnt_off00010ec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 16792 bytes