Malicious PDF — malware analysis report

Static analysis result for SHA-256 183b26e3ffe8dddb…

MALICIOUS

PDF

79.0 KB Created: 2021-07-12 22:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 391e910ebe493496c4817e93e84db1a6 SHA-1: b560271e4101db49c05dade75fc8bf6a9264c71b SHA-256: 183b26e3ffe8dddb26edaa8a7b58244c62a33f39913c6fda6170173cf76ee43c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of an external URI and an SEO redirector link, suggesting a phishing lure. Although no executable scripts were extracted, the PDF structure and the detected redirector URL point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

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/AG-UZpNbJGc/square?utm_term=happy+mode+clash+of+clans PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9325d566ded7d61ad506c/1625895517553/purereralaki.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8643bdd82073f6ff55ed/1626113603790/vixixisuwujopizawiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec83daa1f8f93f64abca96/1626112986927/64326002734.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e909cdf229ba2ea836274e/1625885133784/along_the_period_atomic_size.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e830eb80504e0a776d3955/1625829611200/different_types_of_turbines.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_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16488 bytes
SHA-256: ec9d0b10b9d2df8771b8aa583e9a596ddb721c2d1e7caa99c91a437f57acd4ab
font_02_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 10700 bytes
SHA-256: d030038db443752f882267c71a031a39863c6ba7aa00120ca1551f433fe8d4c7

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