Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ab2f5a516f18ee…

MALICIOUS

PDF

87.7 KB Created: 2020-12-23 09:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 53b9a07a686d97dc3209649b90ff023c SHA-1: e188853db8af6d8e87bf4879ecf47f6d5586212c SHA-256: 81ab2f5a516f18eed2fdf7b7f198b66b14376920763a7f0452cdc35a3a45b17d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a primary link to 'trafffe.ru' which is presented as a resource for IELTS listening test answers. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to drive traffic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery via the linked resources.

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://trafffe.ru/aws?utm_term=ielts+listening+book+6+test+2+answers PDF link annotation
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/nazopepiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fa0f90ca0506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_5f9929de7cc67.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/4907837.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/58e3ee63d4e5.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/porikujeluzad-pojuzogiz.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/nijuvemobaduxa.pdfIn PDF document text
    • https://www.easy-ielts.com/wp-content/uploads/2020/05/b6Test2-s1www.TopSage.com_.mp3In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce086f8a652741489a4cb6/t/5fd614ab267c8d0ace3d8b85/1607865515478/tikukekotijepased.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d900d26ff1194f736c6f/t/5fc3bd1c9ee0f32b87c580c4/1606663454733/blue_whale_mouth_open.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7d305fcdb718a17c69c1/t/5fdcc914bcd75d405e25ae91/1608304917234/weather_report_bangalore_next_week.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe120dd84e8331ef841b390/t/5fe195ed23faae37ab25d731/1608619502294/52272857263.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27abd116eb00e3c55ea17/t/5fc6717818e72e5fdbb5b774/1606840697241/kobalt_tool_bag_set_lowes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28c84be9b6939511547ef/t/5fcc00879aa2de0c647e2d4a/1607204999883/harga_foto_studio_di_kelapa_gading.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_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 5372 bytes
SHA-256: 98a12a12a46bcc7fa82aae457a691bf3b7ccb365c2132a6990558d97a71e8701
font_01_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 11272 bytes
SHA-256: aea0f01431be3202e0276d2aec4afc3b1b54b5b1fc3e99aa3c68fb0ce9fe7782

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