Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab39a27fa3b20d7a…

MALICIOUS

PDF

78.2 KB Created: 2021-05-01 04:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8b0bec514e5af3f5a1c1f3f6f38af3b1 SHA-1: 550665e3bd374480c3ea3405d03311c334e2694b SHA-256: ab39a27fa3b20d7a23764bdd3f8149648c93d9092ecfd92a647ea5a26ca6c251
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 0.9993

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://zajinet.ru/strik?utm_term=night+owl+dvr+not+recording PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458616/normal_600d3b6230eb0.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/jenaxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_600a7f0920f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fd1d29f9a8a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_601a264a338f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_602817d1f1d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_604f2010c7195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_603e681a4d6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_603e3b1423c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374851/normal_5fec4d11b3a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_605b7f2039647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fcd5f644ffdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5ff567f04246b.pdfIn PDF document text
    • https://binapesod.weebly.com/uploads/1/3/1/4/131438069/4f3aa073d431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601d717d97968.pdfIn PDF document text
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/8745324.pdfIn PDF document text
    • https://nonadokemiraf.weebly.com/uploads/1/3/0/9/130969568/keluxolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_604f2f111e3ab.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/3792113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixomirorubu.myartsonline.com/how_to_use_a_canon_rebel_xt.pdfIn PDF document text
    • http://jupevesu.atwebpages.com/komuvorawajivumibigolow.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/homer_iliad_book_1_greek.pdfIn PDF document text
    • http://powagamojij.onlinewebshop.net/46412470646.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_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 4936 bytes
SHA-256: 81ece64cae23a3209fcdc72b616cf6f2677bad605d57962ad80cc7734a208a9d
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 11044 bytes
SHA-256: e5a478ec2f85b99e69742f29fcfb877190354d1fc51a126ce936d73c452c974b

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