Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3875d5add6527a…

MALICIOUS

PDF

77.4 KB Created: 2021-07-13 18:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3f7410bbcf714dca94b5fef1717662f SHA-1: 705f28b9e9a81ae05852cfad9f60208a3aeee240 SHA-256: df3875d5add6527a809695efe633e200336b2f5a93dd90e7b3b928589b5d440d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, while marked as benign, is part of the lure text suggesting a scanned image to Word converter. The primary attack vector appears to be social engineering to trick the user into visiting a potentially malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/iXsW93xxTQA/square?utm_term=scanned+image+pdf+to+word+converter
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7cc7369e16759cf750cd9/1625803891404/59018371701.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7fd4257d2352c927dc133/1625816386672/78513748761.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e831f0f4d7c53d8b16bac0/1625829872265/portrait_of_a_lady_on_fire_criterion_collection.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e791efefb14d11220cdab8/1625788911215/biochemical_tests_for_identification_of_bacteria.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8b286ad76c0974910517/1626114856456/99059866820.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7385947cc46ca126f3e3/1626108805961/90126410932.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91dfe566ded7d61aca4f9/1625890302394/botikukusiraruluder.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7ffa40121f5668999386/1626111994284/12599608707.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e1fdb630645a0ef41a0d/1625874941429/briar_forest_lofts_resident_portal.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8d1a75ef51a130ea0a9eb/1625870759349/10_day_luteal_phase.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec816ae64ce537163497ba/1626112362391/house_bill_today.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 16792 bytes
font_01_sfnt_off0000e4c6.bin
4e7430e601eeee57a8a2e333750d0f4bb5f8eeba561c31f7ecd166831ecf2b20
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 10976 bytes
font_02_sfnt_off0000fe1a.bin
9ede9fecf9e13d50217ffd8085e5dc11ec657f0b2ed814c4698b27ed1a85adb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 16476 bytes