Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f43e8e119ffa44…

MALICIOUS

PDF

69.7 KB Created: 2021-03-01 09:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e1c6b04a4f6330bdfc3d8c4181e8ce2 SHA-1: 6b007887308ecd7979b1f595c3bac0c90c01cfc4 SHA-256: 18f43e8e119ffa44b58a3f2665225053d71e2b4fa524e0a7ba54053d084b99bb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary external URL, https://vilenefex.ru/strik?utm_term=crosman+1077+wood+stock+co2+semi-auto+in+.177%252F4.5mm, appears to be a lure for a specific product, likely to deceive users into clicking through for a scam or phishing attempt. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=crosman+1077+wood+stock+co2+semi-auto+in+.177%252F4.5mm PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474222/normal_5fe4cd66ef4da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377380/normal_600127b4f40e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_600c7ea18b543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378641/normal_5fe0b97fbc39e.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/mebefa-melerasijivu-pusedid.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/ca7823cf.pdfIn PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/4183087.pdfIn PDF document text
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/5752005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ffbd4727ceda.pdfIn PDF document text
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/84010.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/wamatasamegu/lanebiwew.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/zupakagejituza.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/lowazigijijireno.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/airport_city_android_walkthrough.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_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 5832 bytes
SHA-256: f84770e7044bd3cfa021568c1ae889c8a6eeb7c4d03922d0ae09772591596f62
font_01_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 11092 bytes
SHA-256: a7d1e6a9ea7920c50718a21044ba74a3bb20594b507510c3646a5f445fd211ff

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