Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de17803d6deb9b2…

MALICIOUS

PDF

77.1 KB Created: 2021-07-18 20:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91458ced0ce62b498583fbc13d4390c2 SHA-1: 893f33b987ef4c6e41894a1d7aab04975f5f50e2 SHA-256: 7de17803d6deb9b246b4ab2d12c5a260939d0a5596dba1c28a597a2009a16669
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and the PDF structure suggest it is designed to lure users into clicking malicious links, potentially for phishing or to download further payloads. The obfuscated document body and duplicate object bodies are common evasion techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/~3/4P1vZUbBa90/square?utm_term=should+a+comma+come+before+because
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee2f58fd66ff3739ed8678/1626222424239/nopikek.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f040081c2a31383792037c/1626357769012/supplication_after_adhan.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8e7a8c19ad4998dbc511/1626115706861/gavufatumuki.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e87df7f7e8b60c650941d3/1625849335932/tds_on_purchase_of_immovable_property.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f3deb3a9adb72803ac62ef/1626594995496/mitatata.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_off0000cd67.bin
cb8d162f6fa9bd22561a66d037df883a57ebe87f6c0abbbc17e4fbab8923bcf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 10764 bytes
font_01_sfnt_off0000e623.bin
830dc4b9dc3965bfaef3b2f731b216a6a0282d2af23a67c7c14a105e52e67816		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 16324 bytes
font_02_sfnt_off00011048.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16792 bytes

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