Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eab434ce696e769…

MALICIOUS

PDF

76.8 KB Created: 2021-02-08 19:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05986479cdef5239942c4c86b7242714 SHA-1: 97d601749e6f27ff48e2d95fb96bc8016825ad87 SHA-256: 5eab434ce696e76985bdbb8dcd98c0cb1ab449788b2849e7a45024eeeb88850a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, is identified as a phishing trojan by ClamAV and an ML classifier. The primary URL, maypoin.ru, is likely used to redirect users to malicious content or phishing pages.

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://maypoin.ru/wb?keyword=british%20and%20american%20words%20list%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fe8f307e0bd2.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/a4XUsjb/69818073871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414488/normal_5fe4b71ac0e8c.pdfIn PDF document text
    • https://jodutofafedabaf.weebly.com/uploads/1/3/1/4/131452959/joronuw-bemakefasu-buwakulasiweku-pofelodokaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380859/normal_5fe59193531f8.pdfIn PDF document text
    • https://pukuxenusafo.weebly.com/uploads/1/3/4/7/134711282/c289d25.pdfIn PDF document text
    • https://zuxomizo.weebly.com/uploads/1/3/2/7/132710603/1ec3e153a6e3c8a.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/lofolejefesopovaxeju.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/nobofedabofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fd1443c1ed9a.pdfIn PDF document text
    • https://liritetujom.weebly.com/uploads/1/3/5/3/135310948/3f53522c752b9d.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/fabevojolepaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404984/normal_5fd154a83d4ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601337c1c258d.pdfIn PDF document text
    • https://cdn.sqhk.co/gekakisoduvo/hfSjhjj/59733968695.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/hfhcid0/11351594792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_601fb910a3c32.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/werowibovezoje/33918740821.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/bulawibowimipepa.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_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 5536 bytes
SHA-256: 2fd71d289b063737b25b393cc7a07e9ae3544e254d480a205607a641d3b0a581
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 10100 bytes
SHA-256: a99911fba5691c6ed80189e4a5749201e7b6427cccce9d825918950946388073

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