Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31362205a3ab17d…

MALICIOUS

PDF

75.9 KB Created: 2021-06-02 05:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3762b711576fb28b6fbc782e8ab74095 SHA-1: a14f9f258c14aaa82332b21b10c4b244446519e3 SHA-256: e31362205a3ab17d677d9f0d8b790f7e376819afe9f9f08fb10213dc891c0c71
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, which is likely used to host a phishing page or download further malicious content. The document body, though heavily obfuscated, suggests a lure related to file conversion, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/pbw?utm_term=multiple+jpg+files+to+single+pdf+online
    • https://cdn-cms.f-static.net/uploads/4487184/normal_606ad0d580877.pdf
    • https://cdn-cms.f-static.net/uploads/4365549/normal_600e5b44cbcd7.pdf
    • https://cdn-cms.f-static.net/uploads/4483836/normal_606b299cd9ae7.pdf
    • https://cdn-cms.f-static.net/uploads/4402718/normal_602e4fbb49b57.pdf
    • https://cdn-cms.f-static.net/uploads/4407788/normal_602ef43315af3.pdf
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6025fb1867041.pdf
    • https://cdn-cms.f-static.net/uploads/4417824/normal_604cce030e719.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3806a927-a31e-4a5a-9edb-537826ee3919/stock_market_hours_this_weekend.pdf
    • https://uploads.strikinglycdn.com/files/6131c024-e900-4a64-886e-34f11861d2a2/libro_de_acordes_para_guitarra_electrica.pdf
    • https://uploads.strikinglycdn.com/files/6cb8fef6-857c-4840-be84-4d659394dac3/wiwaneduse.pdf
    • https://uploads.strikinglycdn.com/files/a4442c9a-1e08-47b1-84f5-dad536925800/70926289724.pdf
    • https://uploads.strikinglycdn.com/files/f2295983-cb03-4fe6-aec2-7fccf2e41a3f/spirituality_of_the_cross.pdf
    • https://uploads.strikinglycdn.com/files/4e273ed9-ab55-4b9c-a197-ab5a8cc26d5a/yongnuo_yn560_3_vs_4.pdf
    • https://uploads.strikinglycdn.com/files/6b26c18b-c0b1-4767-9f63-db0681fd986e/befomefeb.pdf
    • https://uploads.strikinglycdn.com/files/dcccf2ae-6643-40dd-bffd-7b27c9ad1498/breakfast_at_tiffanys_streaming_voirfilm.pdf
    • https://uploads.strikinglycdn.com/files/d39e966f-caf3-4041-8205-331c22b861d4/50451967033.pdf
    • https://uploads.strikinglycdn.com/files/38aaff96-9024-4ece-9805-e6d81b85a60b/luzifanemoxamaporetalow.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcf.bin
8353b429764f2a88680c6a3dc02720a8d6bf42a983350d068bea4b055c38f34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 4868 bytes
font_01_sfnt_off0000ee82.bin
6c38ee722e97082e87676b88e274c5e6e05ca64286ca8b7b114da8cc32a614a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10928 bytes
font_02_sfnt_off000113d7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 4324 bytes

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