Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79b8b63a2e7e77e…

MALICIOUS

PDF

76.0 KB Created: 2021-07-19 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 199abfdecf1b7ac358aa6a7941d4a5d6 SHA-1: f0eb4d426dec82736bac0f7cf7910e975b5480e8 SHA-256: d79b8b63a2e7e77eb00de5f99ab52c87bb8486995cf1e80dc1aa47cedb87a79e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains multiple embedded URLs, one of which is associated with a phishing heuristic. Although no scripts were extracted, the presence of embedded URLs and the high confidence threat detection suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads. The document body was unreadable, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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/UQ8tT55rDuk/square?utm_term=gfr+rate+meaning
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee337aa005482cc155af56/1626223482243/question_answer_of_sst_class_9.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f40fc69c7c9f0ea9a13c4b/1626607558089/balilikevizanekega.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2eb5b2e59700d3e58c31e/1626532699543/14587001362.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4f2d481f38b20589a23f4/1626665684531/63225542182.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f49b43952f835132e32bfe/1626643267995/how_to_set_up_meeting_on_outlook.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f2f676fb6d8f5e805396ff/1626535542393/when_do_you_flip_the_sign_for_inequalities.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee52bb5f7927514e3ea7bc/1626231483555/44565776137.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee150fc27d1e40a5473c8c/1626215695974/how_to_edit_scanned_image.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed2efd0124a666ff414a29/1626156797770/justin_law_soul_eater.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_off0000cae0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 16792 bytes
font_01_sfnt_off0000e2f2.bin
3ec218b985c9e5d2bfad18a6ffb13bcfa41973502b64f3fdbda04f8040320781
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16212 bytes
font_02_sfnt_off00010cf6.bin
c6f1ffb81999204efd8520ff2c6dbefffb3d8ce92cdaac291dd3e10d4b2b83fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 10264 bytes