Malicious PDF — malware analysis report

Static analysis result for SHA-256 723c600a455e0562…

MALICIOUS

PDF

76.1 KB Created: 2021-05-22 05:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eb4e8e49239fb87666431220a1ebe724 SHA-1: d1c95fbf4f16afde72e76aaab775075f4cfba00b SHA-256: 723c600a455e0562637f701980c519bb886388936f9f7417293a41832ac2799d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=chopin+nocturne+piano+sheet+music+pdf PDF link annotation
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/zeforenupakewaz-nudukuz-rexisigoworit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466676/normal_5fdf8cf7bf492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_6012db94ea9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_60675dde9136f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_602664ec95f93.pdfIn PDF document text
    • https://mixozanuzobese.weebly.com/uploads/1/3/5/4/135400893/tagafozulesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_601a3aaace3b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_6014fb48ef633.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/xalanuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5fcba9c27bfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5fd699d68ebe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_606234f017d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_601ab7d157cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_60372fceb2bfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/959fb8eb-268c-4fc0-90e1-8d07d6ef85f6/25439059369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6a41b8-f57f-4263-91a8-b5b358604c94/fazuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2495d02d-f7c9-41f8-a0ba-9adf226b1e1a/dr._jason_fung_diabetes_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc19246-9439-43aa-8a42-4251d73b0e84/vovefowawamanobidu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 5268 bytes
SHA-256: ca6b2ddf30f613537d9cc674038382f84cbc74d5d9ed990cd07b0257d63a22e5
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 11180 bytes
SHA-256: d44bf4e5bd4547c2b6152111628488e43e1eea8a1156c84b7cb2e4c0863b3bc9

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