Malicious PDF — malware analysis report

Static analysis result for SHA-256 b056e59a97825391…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 15:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35a5ca7695a8dcb664acc06920659d7e SHA-1: 604a287cf2eb6305cc7e6fe4316ddd1e15e0976b SHA-256: b056e59a9782539111b8624d3c87a3ebd36c3c3506cfa455b243d93b916b59df
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to potentially malicious websites.

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://golowaki.ru/wix?keyword=guided+reading+activity+12-3+answers
    • https://static.s123-cdn-static.com/uploads/4366007/normal_6002a3359f916.pdf
    • https://cdn.sqhk.co/leporolino/GUhejfR/second_hand_clothes_uk_wholesale.pdf
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/c63577bf6d.pdf
    • https://cdn-cms.f-static.net/uploads/4495707/normal_5fe777dfef244.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/tolufaxu-zajadan.pdf
    • https://latolupolazu.weebly.com/uploads/1/3/4/0/134017494/e239b.pdf
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/jawoteduti.pdf
    • https://cdn-cms.f-static.net/uploads/4456984/normal_6016df3399fed.pdf
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/dosas.pdf
    • https://rokudula.weebly.com/uploads/1/3/4/0/134017654/b59534552.pdf
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/xovuvevipew.pdf
    • https://static.s123-cdn-static.com/uploads/4470821/normal_5fca70c781ad1.pdf
    • https://cdn.sqhk.co/zifibikom/Xiahi0T/bakobovisaramamezuxel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_f42243ec7afc48caad62cf408d26780f.pdf?index=true
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_30027db50b08485dbeadc0a7021e4316.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_9c5c6d31a0584595802b1ad153e94402.pdf?index=true
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_35131f7bba1040c8b4c5de372fd03626.pdf?index=true
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_baee11116d6649f49fb98be77dad23e3.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_46aa84d739694ba0932aad27e0364118.pdf?index=true
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_fe1cb9d5370b476d9afaca96fad3fc4b.pdf?index=true
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_4b17dcfd44b8486a9bf89ec0e36c3003.pdf?index=true
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_6a8c2e8d7df84022a65fffe338924f36.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_off0000fa34.bin
d2d42f77d461f71fa66aaeaf12ee77b1cbfb749c651c631b3285a6dd7798d4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 5740 bytes
font_01_sfnt_off00010df9.bin
a9e9bf953d4525bcac60fcd168be82e16d7d095066fdcf2bdf8a1aac34c0edc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 10764 bytes

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