Malicious PDF — malware analysis report

Static analysis result for SHA-256 811f0c738bfbb79a…

MALICIOUS

PDF

78.4 KB Created: 2021-07-15 18:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 004109ca8c2e1e936161c2e83510a693 SHA-1: cbe2aef15bdee92533349a9b0256881410678418 SHA-256: 811f0c738bfbb79affeb753446183963d23313e59c4d0c1ae14f51a4acc8ff6e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URI that functions as a redirector, identified by the PDF_SEO_UTM_REDIRECTOR_LINK heuristic. This indicates a phishing attempt, likely using an image lure to entice users to click the link. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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/r_nBws6J8g8/square?utm_term=for+in+r+programming PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee0479e83f616bcf86f6b5/1626211449991/xokirowekorinaz.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee829a7d49fb55d62b3a64/1626243738821/diff_between_homologous_and_analogous_organs.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8ef09c874e7142488c05/1626115824946/29631513062.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7ede288cf71862a90b88/1626111710849/18739583075.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8243a5c1b84600341aedf/1625826362744/past_tence_of_bring.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee1e7cab0cb8743be22155/1626218109104/3605044036.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f048fb5adc3104d8702d38/1626360059391/malaria_is_caused_by_protozoa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e79208872c4c6263c089f3/1625788937450/galabanuxokef.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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 16724 bytes
SHA-256: 339db2ad3f4160bb30007eb795c8d28fac7fd5c26e4499fb46f7d6caed02ba4e
font_01_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 10128 bytes
SHA-256: b7301f77cf24563354185146e734667b5d1036e2ea70e1c252c687465d2467ea
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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