Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1f0e9550f9462a…

MALICIOUS

PDF

80.1 KB Created: 2021-02-22 14:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c4e3fa899716e41980273c60a0c0f118 SHA-1: 086da08627ea2180f24189297ab1366603297463 SHA-256: 3e1f0e9550f9462a8e42b689a279924ad6701bbefa63911f353045481679dede
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. The embedded URL points to a domain associated with link farming and potentially malicious content, suggesting the document's purpose is to redirect users to harmful sites.

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://leonvi.ru/123?utm_term=how+to+solve+a+rubix+cube+step+by+step+algorithms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491965/normal_600acb622a0a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fe48c97b7f97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409246/normal_6006bafba085b.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/jakigagunaken.pdfIn PDF document text
    • https://fusofopafufet.weebly.com/uploads/1/3/5/2/135294951/7989971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff42efdf0e7b.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/6297110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393911/normal_5fc99797bd6e0.pdfIn PDF document text
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/4c8a386d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365652/normal_5fed921da476d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_6025bebf9389a.pdfIn PDF document text
    • https://vipizavubo.weebly.com/uploads/1/3/1/4/131407691/9e7d5bdda7dcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ffb5f9e4f841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_602842fbaff3b.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/vukusa/bettendorf_public_library_information_center_events.pdfIn PDF document text
    • http://ferirapavo.epizy.com/xinevinogakazajelewujomow.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/vitemefojul.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5548 bytes
SHA-256: f979fb690eefeeeeccf1951786c258bfb615262c977f7502d3cb55ad1c7e3a33
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 10184 bytes
SHA-256: 18d504bb8a9ef0908a63b432b5e5918a6fc6903db041a7756d59aa9e0fc507cc
font_02_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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