Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61cbec943e077b2…

MALICIOUS

PDF

87.6 KB Created: 2021-07-12 20:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 56c72b3849a8b34f99fb7ebac01fe6ce SHA-1: 40760d19ff4242504f63c9f4039d0bc5b7e11bcb SHA-256: f61cbec943e077b2a1d6f00788d5f61fd6ba06dbf9d9d3db9ff8d1b943a608ec
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. A high-severity heuristic identified an image lure linking to an SEO redirector, which is a common tactic for phishing campaigns. Although no document body text was readable, the presence of embedded URLs and the overall detection suggest an attempt to lure the user 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://feedproxy.google.com/~r/sq/ugae/~3/ZV5PD9BTPXI/square?utm_term=michael+connelly+best+novels PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7d1cc7e45264421f85f0b/1625805260457/vinajomarexelakob.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8cb57614165378940927e/1625869143738/31143260191.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e948835ebba154a8fd9ec8/1625901187300/28544287743.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8fbe212fb7d0b2791cde1/1625881570486/card_game_called_may_i_rules.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec704c950202184f0e94eb/1626107980321/northeastern_commencement_2021.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_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 16808 bytes
SHA-256: 8f9dea64c37191ce414450b7f2d4bbdde214ba3710b82422dfe5d306a14fa1bd
font_01_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 10540 bytes
SHA-256: 13429583694ab40406021b6ae7d41a1bbc2f758c7b311911e815ffac2e7dbd8a
font_02_sfnt_off00013abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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