Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3841787815cc86…

MALICIOUS

PDF

75.4 KB Created: 2021-07-13 20:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 321e7680a282699a642d454c2df39811 SHA-1: c245a304675d7ca11834d9b10d6e0b0ea200736c SHA-256: 1b3841787815cc86038d1d908e6343c469bb5cfdf5b80cfb5d5f82a93d23124f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself contains an external URI, suggesting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9186

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://laborke.ru/square?utm_term=shattergang+brothers+edh
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8a1244889516feaca97c7/1625858340303/nikusazokezogodose.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7cfdbd0799e4214c00ce8/1625804763523/root_canal_treatment_steps.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9414012fb7d0b279470a4/1625899328424/call_of_duty_beta_apk_download.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec98ac69d4b6336148d90d/1626118316928/new_super_mario_bros_download_pc_game_free.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eca1d2f4b4775d04a1fe75/1626120658191/38609231569.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_off0000cac2.bin
17dd833ca3145f8232c08190bcbebd5f930bf69be06384e3e1bb8df2bacb22ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 10604 bytes
font_01_sfnt_off0000e2b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 16792 bytes
font_02_sfnt_off0000fac7.bin
d3a8ef652d2190bcee6bfdbb88d3e6f2c80457d4df09bcbfd7ac64e8fab80981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 15312 bytes

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