Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff3159fe01ddeb3…

MALICIOUS

PDF

78.4 KB Created: 2021-07-13 19:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ab16d7972a5b79adbc86019d2b85cdef SHA-1: b9ca90e7391b95a1f4c0d6bcb7d290c468317bec SHA-256: cff3159fe01ddeb3beb8927b0f907261b435f20007b8aeb83ca1eac81dd9c08c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated maliciousness. Heuristics identified an image lure linking to an SEO redirector, which is a common phishing tactic. The embedded URL points to a Google Feedproxy, which then redirects to a Squarespace hosted PDF, suggesting a multi-stage lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8287

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/UkUWPC8UKDU/square?utm_term=if+all+the+snowflakes+were+candy+bars+and+milkshakes PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec921c1cff58014d54e7b8/1626116636265/food_low_in_phenylalanine.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e860fdcb142a1539d6d13d/1625841917852/end_of_life_counseling.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c1701b56fd05757a43a8/1625866609046/xikusejanaxuxewimoniso.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e956aa787dde1a90afbbcb/1625904810272/xatiziradedajawo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eda3f7eb7cc826ddc64249/1626186743660/sutenusosanavutanomal.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8d31af807f1e152614c5/1626115377948/why_does_chlorophyll_look_green_to_the_human_eye.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_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 11124 bytes
SHA-256: 691df8b8be016457fa47e45c94421a01b386cb8d995587e170b6d2e3cf4faefc
font_02_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 17260 bytes
SHA-256: 19a72a5146a4e8cbc11d7f3dc3dcb29faf3387d8a6dcbc2aa58db3d82d244f20

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