Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b03e52db739fc…

MALICIOUS

PDF

118.3 KB Created: 2021-04-02 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59cf6bf8615ecc2c5f97dd425ea6487 SHA-1: 55c0b2079d20990ed857ffed665d953b2a3a82cc SHA-256: 8d5b03e52db739fc54b901c7960b03994d0e6a0a9510569a79fdbe8f96040a62
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one pointing to 'https://nipisod.ru/wix?keyword=deep+web+linkleri+korku'. Heuristics indicate a PDF link farm and ML classification strongly suggests maliciousness, aligning with phishing or SEO spam tactics. While no scripts were extracted, the sheer volume of external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/wix?keyword=deep+web+linkleri+korku
    • https://cdn-cms.f-static.net/uploads/4410216/normal_5fd93f9d2f687.pdf
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/9617621.pdf
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/boveleledusufuj_vukexisaso_daxanij.pdf
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/mepobe-fimefekevodi.pdf
    • https://cdn-cms.f-static.net/uploads/4481166/normal_600f16a22cc8f.pdf
    • https://cdn-cms.f-static.net/uploads/4418973/normal_604223f93d4cc.pdf
    • https://jajixawu.weebly.com/uploads/1/3/5/9/135992574/bapefoverenate_jijevezepev_viguzojiwu_pewufuzegud.pdf
    • https://cdn-cms.f-static.net/uploads/4462073/normal_603e30fd9f709.pdf
    • https://static.s123-cdn-static.com/uploads/4458122/normal_5fc9bba45b3b8.pdf
    • https://sizutipaji.weebly.com/uploads/1/3/2/3/132303075/jalokaza_nibukupigulagut.pdf
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/jizoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d9ec6227-8217-4495-a5d8-e7bc0e15a868/how_to_access_onenote_on_mac.pdf
    • https://uploads.strikinglycdn.com/files/67ba7cb8-5540-4ef2-a1ef-59ebd7806981/30111023538.pdf
    • https://uploads.strikinglycdn.com/files/4fae5ee0-a66e-409e-a12a-c29da891e746/how_to_take_bragg_apple_cider_vinegar.pdf
    • https://uploads.strikinglycdn.com/files/d00e3f90-fe2b-4c57-98b5-e93ce58aa7ab/88442289119.pdf
    • https://uploads.strikinglycdn.com/files/5cae46f3-9c47-45a5-a9a8-5173ee987cb0/how_do_you_fix_a_screeching_dryer.pdf
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_c15f7bea3f464cc589bb274aa55f728a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d7a8a27b-946e-4ee2-9feb-9b44342ef80c/rowejutewutuvuwizadupe.pdf
    • https://uploads.strikinglycdn.com/files/cd643071-9c28-47e2-922a-c6c1eb64d322/can_i_get_a_replacement_remote_for_my_ceiling_fan.pdf
    • https://uploads.strikinglycdn.com/files/663e0291-a675-43b0-aad9-3535a24656db/92496270863.pdf
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_b1e73263d82a44d396fc4c210efdf2cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47c8ab76-9fdb-4c4a-86d5-354f55329d88/bafumunomelajuwip.pdf
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_07292d6d059f49a79226bd80ea98f97b.pdf?index=true
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_d8cdb0c56623492fa3455c095b2e848a.pdf?index=true
    • 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_off00014d4c.bin
ea03d4a62ca1de2a0fcfa4f27b70914cf457c2195e252f9abebd115878bd04b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4C 19344 bytes
font_01_sfnt_off00018bb0.bin
842d5dd5d44f10ed55b8f508c0ec0e0acd46c02de9a43991d7ad29bfc77798be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB0 4720 bytes
font_02_sfnt_off00019bdd.bin
66fe69c8a26efecfbe3e7d6f0eec8857d276ab445dd6b6e46a8338b89ad2853c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19BDD 16288 bytes

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