Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ae456ecaf8baab…

MALICIOUS

PDF

76.9 KB Created: 2021-07-15 19:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 387e405ed105a762643c376d95ca55f1 SHA-1: 30a204ca79b266fe7e65921a85c3f90b65a08a0d SHA-256: 55ae456ecaf8baabe7a9670bf0fb09d1077a7c09fbf272491890f02bf1dd4289
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even if some are marked benign, suggests an attempt to redirect users to external resources. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/NsX9ihectO0/square?utm_term=how+to+turn+pdf+into+powerpoint+slide
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7a654a8bde38c343b5ee/1626110565945/back_pain_after_workout.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec996d83836e7a7d62bd6f/1626118509629/pixaruwedurik.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee53935f7927514e3ebd3e/1626231699596/the_most_hardest_riddles_with_answers.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee0a8ce9cbfe6c2fe3e892/1626213004578/34302256467.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eda4c8151a035e9e7c7b7f/1626186952322/munifezodufolovurij.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_off0000cc3e.bin
eed2e9dae5c481cf409693c70d7805d24a4f43748d8587b3d6ec6308ba228479		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 10508 bytes
font_01_sfnt_off0000e443.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 16792 bytes
font_02_sfnt_off0000fc55.bin
cdb4a50b5c70d39d2f6e989f704f683a4acabcf8b769e6a8826d46befb0b98bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 16728 bytes

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