Malicious PDF — malware analysis report

Static analysis result for SHA-256 01500d6e9e5a0293…

MALICIOUS

PDF

78.2 KB Created: 2021-07-12 21:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: afe26604a95f1d1181b5d065312cac5b SHA-1: fd936bcc6cba3f0ea26a3723809513f4999f0a3a SHA-256: 01500d6e9e5a0293eb97e8ea378c123c06d393d6ee1c92579cbdc3451bacf4dd
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 identified as a phishing trojan. Heuristics indicate the use of an image lure that redirects to a URL, consistent with phishing attempts. Although no scripts were extracted, the PDF structure and heuristic firings strongly suggest a phishing attack vector.

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/hIkXU_AiHkM/square?utm_term=why+do+you+want+to+work+for+our+company+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e86ec6131e486bf962143b/1625845447040/55971900694.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e773a4651fad09a6667ae7/1625781156677/13715995663.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e78d1d8ad60325f0c19e93/1625787677970/the_apartment_criterion.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7e3439bae382bbabfd487/1625809731477/muporub.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7fc5a4d2175279d14af9a/1625816155114/xoxidovojoro.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_off0000d033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 16472 bytes
SHA-256: d9a424249f00cae8272e8969549b49b8026264fe8eb09558d46e070c146e8b03
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 11132 bytes
SHA-256: 4de0413dd6ff8ab27b1b14445b6f3bc6ea0849861f222efa4488d0d2a4495db0

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