Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79ce9d95f743261…

MALICIOUS

PDF

115.9 KB Created: 2021-07-13 00:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9bd0c6ec3c61f0b37413441efc729fb0 SHA-1: fdcdcb6956ce1a3cc363b3e95a96541c8e15152c SHA-256: a79ce9d95f7432618d00601e3d0bde4e1c929f3cc95e9d0de8db5711d8bffb2d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0219

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/pL_UGxDroB4/square?utm_term=tigers+in+the+mud+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9426166be7e490f10b675/1625899617877/muet_listening_question_and_answer.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecaf01bb2b39086b6b5d42/1626124033184/bilumanoj.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001284b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284B 11268 bytes
SHA-256: 298316b049c1135ca7953b97f607c32fdb557e0a51de0bea357e6409b8d0b6cd
font_02_sfnt_off00014c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0D 17156 bytes
SHA-256: 2c048e739d781ce3f076643ff219e60fff74f7f56c5bfb68a8c472de10338619
font_03_sfnt_off00016558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16558 30852 bytes
SHA-256: 905b75a3470cf51fc3e0afa3a4d44830f734f86d2ba394dda9ae5f1fe9d25039
font_04_sfnt_off0001ab1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB1F 10680 bytes
SHA-256: 4464890efb1db3712c6afae3e7023252e50632711fd4b1af6d3180a6826fddb9

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