Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd260f836cf5169b…

MALICIOUS

PDF

78.0 KB Created: 2021-07-13 19:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4bd785637a70f28750171a2ccbdb28a8 SHA-1: efa0d22a9f32bee4c66d297feca60df42b33de22 SHA-256: cd260f836cf5169be65f26f846c324e1fbe82b8f879ff652abec339b4e6b3ef8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-severity rule indicating an image lure linking to an SEO redirector for phishing. The ML classifier also assigned a high probability of maliciousness. The embedded URL leads to a suspicious domain, likely serving as a lure for a phishing campaign. No scripts were extracted, but the overall pattern suggests a phishing attempt designed to lead users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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://philabc.ru/square?utm_term=periodic+table+of+elements+without+names PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed39942271a75a72d0a848/1626159509087/17209796842.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edb90842b28049586956e3/1626192136321/mix_brown_and_grey.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7b88154eb17b684929ed/1626110856618/upper_body_warm_up_exercises_before_workout.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecb39945c1203003618c6c/1626125210065/78420119224.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e1f9c4c1a734c5d339ea/1625874938106/mireditenut.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca1ae80388a1034d9dbe8/1626120622492/53840046126.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecb2d35f54a92f3bf8260a/1626125011940/examples_for_thermoplastic.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 16688 bytes
SHA-256: 2b768ccfcb6736c27de216bb57aaf4b862ee97a7f2d60f6a3f842ec863151208
font_01_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 11068 bytes
SHA-256: 66f93f6bc1e702a611d47c76bb1fdf4f151e5188dd0e2a3d18b5295b34c7aab2
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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