Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ad6e4203dd55f5…

MALICIOUS

PDF

66.1 KB Created: 2020-11-24 21:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 986c07e05d8320a00f42bdfb68096813 SHA-1: 1bb8cd73b86cb1e7122db95eca9402fe667da3bd SHA-256: 18ad6e4203dd55f5b48694d31952da84b25cd2541ee66c2d0ea090cdc6d67eeb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One of the primary URLs, traffset.ru, appears to be a redirector for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=ms+project+pdf+one+page PDF link annotation
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/04609804.pdfIn PDF document text
    • https://zesawomu.weebly.com/uploads/1/3/4/3/134321331/bojemegudinowu_sidiminesumik_wolupozob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fa7e767af805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_5fa0915366276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f9877ec21614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5f9568ccd4fd9.pdfIn PDF document text
    • https://pesegomogela.weebly.com/uploads/1/3/4/7/134700410/kisumira.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/ludemogijuben.pdfIn PDF document text
    • https://wekisakalew.weebly.com/uploads/1/3/4/6/134617168/7952830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_5fa95ab30666a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/medicinal_chemistry_of_antifungal_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/word_2016_formal_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/aqua_regia_quiz_2010_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289a4618-14bc-4a90-afb0-40302cc5cd0f/jifejubowajuru.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/zetuvivalagofovakalujeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bcb372-fb78-4cfa-b31a-4a2f54fa88c7/10942515549.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/texikaxewux.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_off0000c3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D1 5372 bytes
SHA-256: 22cef9c08e43d99ded4617b2190253fa7d66686a12506ddabbdd518a5567f4f1
font_01_sfnt_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 10904 bytes
SHA-256: cabc9936aae3cc79805cb63b446c1a40bc13a341814a7af55526e849387a598c

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