Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55dc2222731b613…

MALICIOUS

PDF

121.7 KB Created: 2021-07-20 09:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: df934e63f826915570cadccd76cefba8 SHA-1: a20bbb3c90932f60ffc4f8dbd4b293167bd3060e SHA-256: d55dc2222731b613db7802ef874470aab5ed1ebfd8a04822c7988104110881a8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a phishing lure, using an image to redirect users to a URL. Although the primary URLs extracted were classified as benign, the PDF_SEO_UTM_REDIRECTOR_LINK heuristic strongly suggests a phishing attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5361

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/nCRFBnYrBHY/square?utm_term=who+wrote+the+new+testament PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1602244f13e0787b4e96c/1626431522618/pub_quiz_questions_and_answers_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee701a6bb0602df2147fc2/1626239002755/52693525988.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e932da3ba7d954d546c4c2/1625895642333/camp_kinser_commissary.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_off00017e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E52 16996 bytes
SHA-256: 2f80d1f9b639df711230cb3ae0502af84834f53ba122a8766b817fd6d495481d
font_01_sfnt_off0001aa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA80 10312 bytes
SHA-256: 7274a23d37c74a186ac6cf13dda79f905c65986ce78685c117ed68a5b676ea1b
font_02_sfnt_off0001c1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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