Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f786a5e6b7c2d60…

MALICIOUS

PDF

92.3 KB Created: 2021-04-02 23:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d087107d0daa5c2e4c1cdf07dd6e8eb7 SHA-1: 18c068be919b1b545edb2462928a40e70648371d SHA-256: 0f786a5e6b7c2d60a05f44d2b7d3234e938c4676014d8cad655a7b05c29f0cca
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as search results, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=oracle+sql+certification+exam+cost
    • https://cdn-cms.f-static.net/uploads/4378383/normal_600ae9e860c4e.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_6031b05233fa3.pdf
    • https://cdn-cms.f-static.net/uploads/4497109/normal_5fd27143ca715.pdf
    • https://static.s123-cdn-static.com/uploads/4416921/normal_5fdf9875dbbd1.pdf
    • https://cdn-cms.f-static.net/uploads/4481684/normal_602ef81d40ae0.pdf
    • https://cdn-cms.f-static.net/uploads/4486758/normal_604153cbada2e.pdf
    • https://static.s123-cdn-static.com/uploads/4463552/normal_5fe1a3043752f.pdf
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fcca7a6d7dee.pdf
    • https://static.s123-cdn-static.com/uploads/4373749/normal_5fff9d9fed523.pdf
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5fce5d7ddf4ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5cc74456-b65c-4b25-b5b2-118ee1b1f46b/xirefujitigevusufasabagaf.pdf
    • https://s3.amazonaws.com/gimisorixosu/how_many_calories_in_a_burger_king_breakfast_sandwich.pdf
    • https://uploads.strikinglycdn.com/files/72328f6e-de8a-489f-9df7-8782f44d3b00/fuvetulikutija.pdf
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_0803f9c51b7b41dfb57e4c4e74eb7234.pdf?index=true
    • https://s3.amazonaws.com/turip/28501640541.pdf
    • https://uploads.strikinglycdn.com/files/397b12e4-12c8-427e-8c04-513325611002/the_giver_chapter_8_quotes.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_c2efbfb5f85340dd84418903231f7abf.pdf?index=true
    • https://0633afab-057d-4448-85e1-ac1a97571725.filesusr.com/ugd/66920c_cd035a5a89154b289c4819238659da4b.pdf?index=true
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_4c91d50323f44fecaa8b48a551ba4a14.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
    • 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_off000116d3.bin
27f8a33ccd6022554443e9df84aceda993bb4c4d25ee2bb73919cdf95a21dcd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 5248 bytes
font_01_sfnt_off0001289c.bin
da995c10f238423fa016c73b2233797ce5fbe248b2535fbc5244ed358e093515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 10952 bytes
font_02_sfnt_off00014e1d.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 16164 bytes

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