Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f290a032dc15a02…

MALICIOUS

PDF

77.2 KB Created: 2021-07-13 19:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8e01ca1474bf0a8e6cb90c0032131dfd SHA-1: 751adcfe7f19361ffa42254a753a4162bb1a70ac SHA-256: 8f290a032dc15a0219bbca4556f9eb2c9afa63dd0acb8976028b81b569c92886
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 high likelihood of malicious intent. The presence of a PDF_SEO_UTM_REDIRECTOR_LINK heuristic suggests the document is designed to lure users to a potentially malicious external URL. While no scripts were explicitly extracted, the PDF structure and the detected redirector point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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/kVSxLQpkboc/square?utm_term=old+melody+songs+tamil+audio PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e94866c0906550d90c75a7/1625901158132/kobolerupuru.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e91d9f3ba7d954d54610cb/1625890207842/muvezerenagorazi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ec9eb630645a0ef4d706/1625877663074/10562649887.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8271c4b964f05b84b1923/1625827100326/53982985848.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eda987262c1d401135a91d/1626188167717/song_i_cant_tell_you_why.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7861517360437f0357658/1625785877276/bunafepirutomulilatuzasu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e904218ce0e10532d19cb2/1625883681500/zewaled.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9941e0914637f38ce3ca/1626118465380/teguduje.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_off0000ce66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE678 16320 bytes
SHA-256: e4cf07c262a73abb1c5f89acc11703fd48910a9f8a01025be7de4f49fd2e2b00
font_02_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 10732 bytes
SHA-256: f8766ec9accd99b00ffff2340137acd9c090214236d9033c3783316305c4c27f

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