Malicious PDF — malware analysis report

Static analysis result for SHA-256 8285a0490d6df816…

MALICIOUS

PDF

74.5 KB Created: 2021-07-13 17:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd90baf65bf9ffe3ac5ea37f3194bea2 SHA-1: 0560bd132df476de7f28402a47527db9c00136f9 SHA-256: 8285a0490d6df8166ecdb4f22ffdb3f2bf1e2aa9704c4b327f31b0b1640838bc
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically points to an image lure linking to an SEO redirector, which is a common tactic for phishing campaigns. Although no scripts were extracted, the presence of embedded URLs and the overall detection suggest the file is designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6911

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/UZrB20b2Dcg/square?utm_term=lyrics+to+where+is+love+from+oliver PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8eed1e370ac632286b1fd/1625878225569/jopusavotuwisu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec92b111a746407a428c1d/1626116785677/pidijonakut.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e95ab4e51f1f218d6ba47a/1625905844397/94499420338.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec92f1478ebe26bfc6c7e3/1626116849529/another_word_for_tremendous.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_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 16684 bytes
SHA-256: 97a801320120dddf940c63d20857e218ca9a21cff38681a5b6f641f0e7f4c942
font_02_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10556 bytes
SHA-256: d824ac059ed739b41ec22e92b9afe8c01b0403ca3b2459e2082cc537979aae51

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