Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e4bebc876d1bbe…

MALICIOUS

PDF

77.9 KB Created: 2020-12-20 22:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ac1d11f9f83ece525a21ea270c278de4 SHA-1: eee2199424496e2d4d266f41216740174029dadc SHA-256: d1e4bebc876d1bbeb396ad398b62953aa30623625d6be3a1407cdf713284377c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary IOCs are the initial external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=hoover+canister+vacuum PDF link annotation
    • https://kironipopobak.weebly.com/uploads/1/3/4/3/134308812/4282765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f9b0cb467845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5fc7562357e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446263/normal_5fcd7a875de2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fdedb3bf0a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fd790fcb7f77.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/411246.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/dikobepibelun/nccn_guidelines_colon_cancer_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/67551888284.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/does_steam_limit_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/naxelofuboxolumafekinovur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb4a3eb-c560-4d86-84d5-e312b89c5505/raising_cain_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e727ea4a794d5645064f/t/5fc142fc9ee0f32b878111ff/1606501116853/767668046.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/46644110827.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 4816 bytes
SHA-256: 6f5adae91c2769eb206a296c73c9c90c39ab401db8244567d36e34adb2950169
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10848 bytes
SHA-256: 15c6c9edacc604aeb2e69f859fdb9edb67458879b675007ca1d236469aa7b075
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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