Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb473e20d099560e…

MALICIOUS

PDF

128.9 KB Created: 2021-07-12 20:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cb83b1ad556b8e4052288e70cd814293 SHA-1: 8c517580cfa78184b551b9fbb29badb2d246535e SHA-256: bb473e20d099560ee8c2211300c732fbec1ab4445cdbc3cf30b01e9521daf682
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic indicating it's a phishing lure using an SEO redirector for a free download. The embedded URL, https://allytemp.ru/square?utm_term=bifocal+vision+psychosynthesis, is identified as the primary malicious link. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting the phishing classification.

Machine Learning

  • Nyx PDF Classifier clean score 0.0948

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://allytemp.ru/square?utm_term=bifocal+vision+psychosynthesis PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7c9a4d93aeb546a139341/1625803172616/35559453484.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8b14bf0e3534f504b4ba6/1625862475467/manual_muscle_testing_knee_flexion.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_off0001953b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1953B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ad52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD52 10708 bytes
SHA-256: 54b340ab3ac3ffe2207134a48d11efe98740abb65fc733eb88cad747048f9528
font_02_sfnt_off0001c5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5EC 19628 bytes
SHA-256: 4800b0a6848dbe28100cf59e101b62b894418255ad06764ed3dd0a55f773532f

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