Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e6e69b43e9a028…

MALICIOUS

PDF

65.6 KB Created: 2021-01-15 06:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1cf422e718ed05eae9d2b168714a0d7a SHA-1: 24c69f616b3313278ffbec89b0de3bfd85f23a4c SHA-256: 41e6e69b43e9a0283d1a9437a15a2d977c00f26ef83330e40625a3e1d269e1ef
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary URLs, traffnew.ru, is likely used for malicious purposes, potentially as a landing page or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/aws?utm_term=ancient+greece+map+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5f907f189af73.pdfIn PDF document text
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/digolikijelikowipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fce6ef4e8c9b.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/sawiwarixa-guwuvepo-morumenifu.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/falufusu/customs_officer_pay_reform_act.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/hayashi_econometrics.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/zen_do_kai_massena.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/5387947044.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/guzeviwo.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/ielts_listening_2019_with_answers.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_off0000b746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB746 5472 bytes
SHA-256: e0b92aeab2f5f9dd1c39043ec6f6e19cf3cb544cc0c6b5e8eddbea36526c0fc9
font_01_sfnt_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 9860 bytes
SHA-256: 37545013bf6436a6d67a02d4c1f2410d26a1e2feddc1a4e130d9f0ac2d1841d9
font_02_sfnt_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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