Malicious PDF — malware analysis report

Static analysis result for SHA-256 d156579699c78d21…

MALICIOUS

PDF

75.6 KB Created: 2021-07-14 03:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 15f4ab12418c6abfaedbe889a2e69865 SHA-1: 2ec525103b3c2ae10caa1048ecde750334a6f864 SHA-256: d156579699c78d21db842e8df9f7c6b2111797ad5ec956e91e1eb69ad23250b9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document, likely using embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/AG-UZpNbJGc/square?utm_term=canale+mussolini+pdf+download PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9200e0ada229be580adb/1626116608386/small_business_research_paper.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7d7c59713006cbe0adce/1626111356899/difference_between_fee_simple_and_leasehold.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e813dd85664d35b0e9c878/1625822173540/wimab.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e86df7131e486bf961fc5e/1625845239364/goodyear_aviation_tire_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92d54b132fa362073ea92/1625894228231/filling_a_check_out.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edc3e6a0f2ca3483cf1f8c/1626194918983/mevojiwo.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee0a44f72ce0266e0bb0d2/1626212932396/13_colonies_answers.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_off0000c1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 10680 bytes
SHA-256: 152fa74187dde4e8d86591c8af4a541c6fab885d3b0af04c9dd58e3840c41ec8
font_02_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 18068 bytes
SHA-256: c6d628ec1ad87e0ae3c1496498e715b7e0ce3f657eb6af8f29bba88d1031dfef

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