Malicious PDF — malware analysis report

Static analysis result for SHA-256 521f12e65230c531…

MALICIOUS

PDF

62.2 KB Created: 2020-11-14 20:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c2186485869b04b7a8e3d628b4d7803 SHA-1: 14f160511553f85246ca26310af7e5da041a05a6 SHA-256: 521f12e65230c5317d9d4a15d565f7c41c84250bee8be21263ed168d3bb1b9a7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=the+constitution+crossword+puzzle+answers+lesson+3 PDF link annotation
    • https://detasove.weebly.com/uploads/1/3/4/5/134594091/punemifuwiwaduz-vikaviradamad.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/rabivugofuwulejixub.pdfIn PDF document text
    • https://bavexopifepixab.weebly.com/uploads/1/3/4/6/134683122/2138825.pdfIn PDF document text
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/9721750.pdfIn PDF document text
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/868709.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/4baad.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/kosufego.pdfIn PDF document text
    • https://pumizisumene.weebly.com/uploads/1/3/4/0/134017803/bakenutabile.pdfIn PDF document text
    • https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/tixukepoburafejiraxa.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/biwuvuson.pdfIn PDF document text
    • https://zexaloguf.weebly.com/uploads/1/3/4/5/134576330/xovugiborofe_xemopilijiji.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/c0c6745861df0.pdfIn PDF document text
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/kumiditolodos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5707238-c5df-44c9-8bca-43216c5e41ce/zoxefipojakijalezoset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0d5b0f-d2d1-4a7f-90c4-714ea944f56d/nazuweji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a99c07-224f-4b2a-843e-a9deb1b9cf38/xawux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45900611-238f-4e2d-8805-b696936129d2/tibaxelekejuwalo.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_off0000b5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 5416 bytes
SHA-256: 6582d79c060893210abb4b7592009e42c5d9409549679462cb2f129f46a42633
font_01_sfnt_off0000c83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 10252 bytes
SHA-256: f09ed379a3df6bff148854d9e16a0e37f5dfa566ffb2372066135a805437651f

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