Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd22a1d2b5374f9…

MALICIOUS

PDF

83.3 KB Created: 2021-07-14 08:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b1e73887dd16d908243ca413f1fae24 SHA-1: 1697c23ba86ef5d6d91f03625afc0b3107316470 SHA-256: cdd22a1d2b5374f9c171a124a5ff4ab144bb00d431b2640feac14ccad7dfbf75
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL, https://philabc.ru/square?utm_term=wirecutter+blackout+curtains, which is likely the primary lure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest a phishing attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

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://philabc.ru/square?utm_term=wirecutter+blackout+curtains
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e84d481bca2d4c690ed7b1/1625836873077/dolidedonadezajuxekizifut.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7d4874d2175279d1322ef/1625805959969/jokiw.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8f40fe6a58043b68f8baa/1625879567696/57387139335.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e949a83f195e1e40378f1d/1625901480725/nofewetupotunewerewevip.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edab664325c5343bbb0a37/1626188646573/referencing_a_chapter_in_a_book_apa_7th.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee04bb7979814f85ac44ad/1626211515403/in_home_alone_2.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edaaac573bc4731c8ab48c/1626188460442/employment_certificate_form.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edd3e59942ff19c76647cd/1626199013921/tewoderodefavomevewed.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_off0000e4b8.bin
78750c507214fdc247dc52c952ee806d8b9e7dc2dfa31b21593a35dee97515ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 10548 bytes
font_01_sfnt_off0000fcec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16792 bytes
font_02_sfnt_off000114fe.bin
9a6b3ddce9e753607ba0457e8889561cf577eba99c48e310ba0d9bd40acc4405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 16940 bytes

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