Malicious PDF — malware analysis report

Static analysis result for SHA-256 e379ed9e05e8b46f…

MALICIOUS

PDF

74.1 KB Created: 2021-07-20 10:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9248af30894a0e11c1fcd9732a253d5f SHA-1: afceda6d871479b645be71039e644918aa78f74d SHA-256: e379ed9e05e8b46fc2d3fdba55134eddfb1d4363d031b1ebe08d6b68a6f4a912
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that uses an image lure to redirect users to a URL, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically indicates this is a free-download phishing lure. While no scripts were extracted, the PDF structure and external URL suggest an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7218

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/sq/ugae/~3/AG-UZpNbJGc/square?utm_term=information+technology+in+manufacturing+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8169986d8930991a8bfb5/1625822874048/foul_play_and_cabernet_puzzle_solution.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f40763b84a576e6c06e45e/1626605411985/stick_fight_the_game_hack_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f4ba3336db646251aff234/1626651187615/timber_frame_and_brick_construction.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec90d54f2b1c51afa4c85b/1626116309444/8873078269.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_off0000c0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16780 bytes
SHA-256: 66021dbcae7afcb29c5360033655062a8ba041c72e0c561793f63ab21a9d8dbb
font_02_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 11064 bytes
SHA-256: 76ba08321a1f0c37b818f02543a139ba6864d49db92f39f8a1e26a933bd14555

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