Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1cf8db90bfd4ff…

MALICIOUS

PDF

91.1 KB Created: 2021-03-24 06:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a1c146078571ba29f3b4bbc0da68e6e4 SHA-1: cc35f53a69bb9aaf25e17bf054d6c380473fbb24 SHA-256: 7b1cf8db90bfd4fff3118bad0411b32f297352f9e48de895763b0d7614b813fc
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or a secondary payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=cerebral+circulation+physiology+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379371/normal_6005d90b9b597.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/diPGjcH/futanadoximivoxape.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/hhhhbw5/87166084549.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/djcoihs/alibuy_best_deals_coupons_new_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/jbhhXsE/42064199593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6034ea0380ab0.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/jhaoeih/zivagawowizunadugu.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/cgcNUxm/diamond_crush_silver_wall_mirror.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/the_magdalen_manuscript_read_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b0d687-8c04-4e43-b007-9d045500c392/can_you_tint_a_golf_cart_windshield.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127b77be-934d-4ee7-a044-dbebbdfacf5c/zuzinesodumuvawoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e454587-ca48-4f1c-ac0f-81d0259c7929/techno_gears_marble_mania_galaxy_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/56784311795.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/buwerisutojimulal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1096bc06-ffeb-418b-8d39-46ef55b574c7/15487304826.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/my_element_tv_isnt_working.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://scripts.sil.org/OFLIn 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_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 5564 bytes
SHA-256: 90490ecef7c557feff02440fa026699bfaa35df919489ecb0fc04994b9817e6f
font_01_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 11464 bytes
SHA-256: 79ef82afbc51572113ae4ef2f7406af4110298e1f00d7e56fce2d8d69ab08da6
font_02_sfnt_off00014988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14988 16152 bytes
SHA-256: dfd7d030819f8f36f00e0667e8d7bd3a365fbb75b6d4a30872085af3b84c029d

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