Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdfe43370e62db7…

MALICIOUS

PDF

75.5 KB Created: 2021-07-13 22:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4a78ceee4986938db73eca4d1e23ceaa SHA-1: 1aba00cd3c080a058de75721272b0f3a1ed0f947 SHA-256: dbdfe43370e62db77da6589459da9671b351e0614e40ede6775b9b72c091c54a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high-severity heuristic firing indicating an image lure linking to an SEO redirector, identified as a free-download phishing attempt. The ML classifier and ClamAV detection further support its malicious nature. The primary IOC is the redirector URL, which is likely used to host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9070

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://allytemp.ru/square?utm_term=75+divided+by+5 PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e926692210ba6bce125414/1625892457301/things_to_do_during_foreplaying.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edab7c151a035e9e7d30eb/1626188669214/63027590799.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8ccbbf28789513b646542/1625869499352/23533872579.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7859f05bd8420fe06e144/1625785759186/jobs_with_great_benefits.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7888538ed220952a87867/1625786501096/sidom.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_off0000ca24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA24 16452 bytes
SHA-256: 144435881cd7fc17038edc4bd25333d3a9448ac23c80bcc16e88b4b1040b2807
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 9852 bytes
SHA-256: e407eb7fbe86a67612045d84589eb54b7941303c2680525454c43367f5946aa3
font_02_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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