Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ae20fff5d5086f…

MALICIOUS

PDF

80.3 KB Created: 2021-03-21 09:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0851215e76ee87266730a6c42a8b6978 SHA-1: a012a75ee9cc64361f25c68695cc8e9e4901392f SHA-256: 85ae20fff5d5086f39b5eae038db746477cc80ec72486f89cdfb4cc0ac918ae7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/123?utm_term=archery+mod+apk+offline PDF link annotation
    • https://garuvopu.weebly.com/uploads/1/3/1/3/131398288/af4260b.pdfIn PDF document text
    • https://cdn.sqhk.co/tabotewo/aheidir/bajesab.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/0giXzzR/galopinipudokakipute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_601c9d02c6e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_604627f153037.pdfIn PDF document text
    • https://gimepaponu.weebly.com/uploads/1/3/4/6/134614910/kunumizu.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/d50c8b2c93.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/ganinujazeb.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/6420942.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/32d63f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_602ff6dd1b2ef.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/evKT0ib/46180655535.pdfIn PDF document text
    • https://bemaxeviliw.weebly.com/uploads/1/3/4/4/134482954/39d198742d32.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/gedJOhg/gogo_live_twitter_wikwik._com.pdfIn PDF document text
    • https://lovemaxo.weebly.com/uploads/1/3/3/9/133997317/7463716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_602018c56a5c4.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/7981061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_6c906a693d4d4814974e3166b0d2bea8.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_0828b83628dd4204a5ad9a445298b8e9.pdf?index=trueIn 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_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 2880 bytes
SHA-256: aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344
font_01_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 5372 bytes
SHA-256: 152709e8db0e4c480c2e8f52c004a0f3b5eef78c7ec6997a5b041564b6907946
font_02_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 12172 bytes
SHA-256: 58794f78d0ca23e28e7a8db488ed2b9a0a8e8f73f234780808258496772dd94a

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