Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4c99e3e13eeda4…

MALICIOUS

PDF

88.9 KB Created: 2021-07-12 22:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 23413f8760a896c867706c87755be3d7 SHA-1: e6254d5a3388375fe3172d1538ab3a572d4d67ce SHA-256: cb4c99e3e13eeda472f9588fa48d6db6d5c2604edeae4a24c2a234821babe67a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. A high-severity heuristic identified an image lure linking to an SEO redirector, which resolves to the URL https://allytemp.ru/square?utm_term=change+the+order+of+integration+in+the+integral. This URL is likely part of a phishing campaign designed to trick users into clicking through for a supposed free download, ultimately leading them to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8172

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=change+the+order+of+integration+in+the+integral PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7911eafd06e4982e60758/1625788702240/catcher_in_the_rye_protagonist.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e90d893ba7d954d5454f7d/1625886089272/what_is_the_difference_between_illuviation_and_eluviation.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e76c8259d923514b22350b/1625779330992/the_sims_1_download_mac.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec917958d864752e022f99/1626116473291/86246752488.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e78202f1bb8b178e1a05cc/1625784834532/77381587538.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_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 10496 bytes
SHA-256: 586ad27de230168f59fa443f1341a455435cc04299693477a179cd58a164914e
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 17624 bytes
SHA-256: f5b3a78774c593fa95d5497309aea15ea9c513e10532824ef015aebb3c1b6a09

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