Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e36457cc3f376b…

MALICIOUS

PDF

75.4 KB Created: 2021-06-01 11:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7aa22736bb99dc17850843f42eafdff SHA-1: e7be26cb75f496f91ba28c9ebd60bc8dd6d74ed4 SHA-256: 00e36457cc3f376b712a393af94c7dbe72a36ec289d09315b9091a37ed57e51b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful 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://ketchas.ru/pbw?utm_term=how+to+tighten+a+bolt+in+a+tight+space
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5ff06e37c5455.pdf
    • https://static.s123-cdn-static.com/uploads/4378845/normal_5fca4d507eab3.pdf
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/1d77201409db3.pdf
    • https://cdn-cms.f-static.net/uploads/4380531/normal_601a7f1349ad2.pdf
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/luzubo-fuluwituris-nemowogilige-fibexiwixavov.pdf
    • https://static.s123-cdn-static.com/uploads/4476301/normal_5ff7858bb83e5.pdf
    • https://static.s123-cdn-static-d.com/uploads/4369323/normal_60b38e5a80868.pdf
    • https://gepubife.weebly.com/uploads/1/3/4/3/134315704/xakoxem_xakokikozegugul.pdf
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fe4b43dafda3.pdf
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/e3f03f.pdf
    • https://desijikero.weebly.com/uploads/1/3/5/9/135964668/dudavake.pdf
    • https://cdn-cms.f-static.net/uploads/4470833/normal_606195ba0e0cf.pdf
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6009d21845901.pdf
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/0ff0ce8354.pdf
    • https://cdn-cms.f-static.net/uploads/4407060/normal_6041e3c445021.pdf
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5fda0b83903d0.pdf
    • https://static.s123-cdn-static.com/uploads/4365636/normal_60021b41366a4.pdf
    • https://newzealandrx.co.nz/buy-cialis-soft-new-zealand.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63391ef8-a862-4890-97eb-17818438e7f2/jasetil.pdf
    • https://uploads.strikinglycdn.com/files/013ad2cb-ce14-43c6-a655-5c8bd97db0f8/bomba_hidraulica_paletas_funcionamiento.pdf
    • https://uploads.strikinglycdn.com/files/65bcadb8-527b-4c12-a13d-00fa1b20a595/40640402031.pdf
    • 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_off0000e8b8.bin
73a3286aeaa85df4ac950e23419cc41c9e8e09d8d64379ea35c71c398e9c7e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 5292 bytes
font_01_sfnt_off0000facc.bin
3ead552414293bb1b49b3f61178689a777696de9927e6c9f7189dd02247de751		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 11092 bytes

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