Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58fe884e7e26340…

MALICIOUS

PDF

71.4 KB Created: 2020-11-11 17:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 96cc6422032a706cc167850f8e8d88d4 SHA-1: e6c84caa71fd413ef13edeaddce57ec17411e395 SHA-256: d58fe884e7e2634028c04a884f9576043fcedc7752ebd55aa712aebf2ef124da
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, with the document body and embedded URLs pointing towards phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings are sufficient to infer a malicious attack pattern.

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://traffnew.ru/123?utm_term=kings+and+knights+crossword+puzzle+clue PDF link annotation
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/4308049.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/a4ca0b37.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/d291b735d1adfd.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/22d6fc57fe7734.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/7068488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/60347730759.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/the_ghost_bride_full_movie_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a89a0a-4c2a-497f-9636-f932d6c7f098/69492841131.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/makalah_akuntansi_perpajakan.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/poultry_diseases_symptoms_and_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/authentic_leadership_questionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/john_lennon_jealous_guy_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3bb14f-33c1-48f6-901a-e929493f82c8/holly_conrad_leaked_nudes.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/sepuwowuximaxog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 5392 bytes
SHA-256: 4f831ce28f655581adadff3bccb7cadaec221ea3be0f3ba4224bf960bdc36f52
font_01_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 10644 bytes
SHA-256: ff7a776dd0ea80c0121fe3f49a1c2d854619f2b6ac91353c09edcaf5ba5360f5
font_02_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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