Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b5978e052ed93c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-12 20:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4ccd4758012773c3e37d017d0dcf38b5 SHA-1: 714b685a8cec3dec0520174b33c092786f331a98 SHA-256: 71b5978e052ed93cc4fc751fd93c6d0b4bbf919985c86cdaf97d7c8cc7a83e83
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan, indicating a malicious intent to deceive users. The presence of embedded URLs, though many are confirmed benign, suggests an attempt to redirect users to malicious sites or download further payloads. The PDF structure itself may contain exploits targeting vulnerabilities in PDF readers.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4119

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/gPkW7oTCsL0/square?utm_term=abyssal+diving+suit PDF link annotation
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95bebc91b61347ea54c1e/1625906155800/promissory_note_purchase_agreement.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93eecc0906550d90c2194/1625898732234/past_continuous_and_past_progressive.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec78ebc217102653d50d07/1626110188047/tisexesamonixuzedi.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec701412c1416d2f18b37a/1626107924711/principles_of_biology_lab_manual_5th_edition_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 10472 bytes
SHA-256: a3a6fb20d00d0de3477a95a72a52eac9f4364a8871c31610f6f11e5fa6bc51b2
font_03_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 18104 bytes
SHA-256: 742b5422b9c9486b094fc28939c020c35d7e0691d214e3954b1a6f5c946ad384

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