Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff37179d5e25c24c…

MALICIOUS

PDF

91.2 KB Created: 2021-07-15 09:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bb1b65102ea5442a45978981c8e4c824 SHA-1: 1d25abf5c0c0c567ee1d13b64925668baec0be58 SHA-256: ff37179d5e25c24c06d1b98df6fe9848577877590b4c2b24a1087421b34613af
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a potentially malicious URL. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URI suggest an attempt to trick users into visiting a phishing site, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6187

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/~3/1LSSs5qy-i4/square?utm_term=picture+of+the+moon+lyrics PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8c227b80adc27fb5834c0/1625866791693/bizutakajopipakuz.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e821948f757b1ac4544344/1625825684718/standing_broad_jump_average.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec78737e2b6271615a4e65/1626110067206/class_10_chapter_1_biology_life_process_notes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 10652 bytes
SHA-256: aefbfd1a0fe3bfb91329ba33ac90d1a6641fdb0954a27bc1c92f581b54a13c9d
font_02_sfnt_off0001330d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 18388 bytes
SHA-256: 519efbd9c43f567d8d0959c4cdda4105df18e30f128f5bec26b47c3fca4e2d2f