Malicious PDF — malware analysis report

Static analysis result for SHA-256 13741e3be8d7575f…

MALICIOUS

PDF

74.6 KB Created: 2021-01-08 13:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c9b6dc8fea7d2708375a67e04b886c9c SHA-1: c6988fa169b133f6bfb9fb2752dd08c952d7fe44 SHA-256: 13741e3be8d7575f22fd6505afa2d4d0f3b47f42e85c1c6e3d7a05c6602e3c86
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'piano sheet music', which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=o+holy+night+piano+sheet+music+pdf+free+easy PDF link annotation
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/8058853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff203af55966.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/Zjdibhj/lego_elves_queen_dragon_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fdb5c432a1ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373753/normal_5fe5b92af039d.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/bjfhdJz/98454694042.pdfIn PDF document text
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/tirugevamusex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e4cb94a-1dce-4dee-a9f0-f119fc7a3c20/milady_textbook_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0308e79f-1bc5-4e41-92a8-74127a27542a/gawadegaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64d919d-9880-43c4-912f-e334c0a830a2/66876250473.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 5700 bytes
SHA-256: 0f29a39be03ad4aa2a004bf2f128447df359e2be2f5b7247e40cc42b1d15865c
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10456 bytes
SHA-256: 1f74ad1c459bbc3eaccab487a1b360c6acf87328b5b848588f8400288902b734
font_02_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52