Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc3c86f6558f046…

MALICIOUS

PDF

86.0 KB Created: 2021-07-20 13:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab34bfee42d23e41790d232d9a602fd5 SHA-1: 8b894d3f497c517d848bba57d12df361079b2447 SHA-256: afc3c86f6558f04682c86ce48f4d2ce3f1e6b8bee07f15c11a77a50bb6f1381f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and the PDF structure suggest it is designed to exploit users, potentially through phishing or by directing them to malicious sites. No scripts were extracted, but the PDF's nature points towards an attempt to deliver a payload or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8083

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/sq/ugae/~3/gOBB6uaVNRA/square?utm_term=butte+to+missoula
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e821814aaab0286a8d580f/1625825665387/ancient_war_strategy.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0767804801d6486b26fb3/1626371704257/st_agustin_colombia.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f08ef9214701376a356c64/1626377977768/nexosejasojorinowuwifitos.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f6161d5f306a537f74c611/1626740253554/the_definition_of_trudged.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee5da3e9cbfe6c2fea2c3c/1626234275352/a_modern_users_guide_to_the_black_pullet.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_off0000effe.bin
a1c130b79c9fe0c3f62bbeeab05b7d85ed4429f69f28542618a5dc38834dd60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10220 bytes
font_01_sfnt_off000106ff.bin
9b6be4018cd93b705686e906822c72f1e2a2f06da6bee4e0b73fc59e452f0d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 17332 bytes
font_02_sfnt_off00013480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13480 16792 bytes

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