Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9da49f78b211112…

MALICIOUS

PDF

74.2 KB Created: 2021-07-20 21:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b12cd51e41626f286bef1c1d1c2068ad SHA-1: 5444ed11319230885d7e6d0bd4d4361b1aa101f9 SHA-256: b9da49f78b211112706fbf8f3e4ad8a6f113661482ed81b0407fdc492701d3b9
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan-d2568dad23a94d95', indicating a phishing and trojan payload. The presence of embedded URLs, though many are marked as benign, suggests an attempt to redirect the user to malicious content or download further stages. The file's structure also shows duplicate object bodies, which can be used to obfuscate malicious content within PDFs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2686

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/AnJPYMJXbyQ/square?utm_term=the+best+way+to+learn+is+to+teach PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f5641225edf12306724011/1626694676092/at89s52_microcontroller.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f2ae6c54c26a0cc3f46b98/1626517100695/one_way_out_solo_tab.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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16180 bytes
SHA-256: b453a0b4d830db08db426ff3e27e61ae20fbc6dbdb75348df582892f40ab7943
font_02_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 10628 bytes
SHA-256: ec2b2b406fbab7975468764e140faa11120b036dd9a58c5216ed80a683296405

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