Malicious PDF — malware analysis report

Static analysis result for SHA-256 c166aae7910adabb…

MALICIOUS

PDF

75.4 KB Created: 2021-03-31 06:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62c3c350211c32026c19180b27c971e9 SHA-1: 942d03065c5802649e1563b636e6dc75301d0a08 SHA-256: c166aae7910adabbfa48dc97308c3fc9a1a7be03418d6c90452b1a428ad6f718
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one identified as a potential malicious URI. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=innova+3030g+update
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fd90e924f160.pdf
    • https://cdn-cms.f-static.net/uploads/4462073/normal_602fcec78cf54.pdf
    • https://static.s123-cdn-static.com/uploads/4366956/normal_5fe30e3d7487e.pdf
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fd2963da46a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_7f6158f699674493ac62ddc7d9aed67c.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_19f2435d740b4f30b93f6720188a3d18.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_6bae6aff223b4d0ca5c531dbca088f69.pdf?index=true
    • https://s3.amazonaws.com/kozibowisenatu/urology_drg_codes.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/dozigujiworox.pdf
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_00a4bd73246f425aaae6111d05e99aa9.pdf?index=true
    • https://s3.amazonaws.com/waxapoz/25622249161.pdf
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_04640630ef2943f1a19f3dea8de8800e.pdf?index=true
    • https://s3.amazonaws.com/bagokiko/pradeep_chemistry_book_for_class_12.pdf
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_8c986b35d7f54cbaa3c9658771666f21.pdf?index=true
    • https://3012fa3b-51b7-4264-898e-e15d6fab1eb1.filesusr.com/ugd/ee5524_3967d996b1c44f11abc290dff6bb71f8.pdf?index=true
    • https://s3.amazonaws.com/guwutivupudutu/music_spotify_premium_iphone.pdf
    • https://s3.amazonaws.com/vufupu/tobinumovurifajovi.pdf
    • https://s3.amazonaws.com/bejokazemur/1_to_500_roman_numerals_chart.pdf
    • https://s3.amazonaws.com/rurosaveruk/37351673233.pdf
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_20f44a95f01e412396c64317b6fec8a1.pdf?index=true
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_19430fa1139e402980bcdfd977cb17c6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e918.bin
0bc65e14029da6f49e8c0aea00fa9a3884287c040c123dcacd8a2101da9f36b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 5124 bytes
font_01_sfnt_off0000faa3.bin
c57dc668f3f91cef7dfc6a2e87bd7fa78cf70f24cb5196fd585a9bfb48c5cebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 11232 bytes

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