Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e8f38bd5a9c3f9…

MALICIOUS

PDF

67.2 KB Created: 2020-11-17 06:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a3c002187b8068bd6c44f1e2f24f3dff SHA-1: 1ea1a98cd863198986894f2bbb5f3b0595910721 SHA-256: 50e8f38bd5a9c3f9657036c79cd51fed340de999ab83b03a289046e80eb13067
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is trafftec.ru, which is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF structure suggests it's part of a phishing or malware distribution scheme.

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://trafftec.ru/123?utm_term=colt+state+park+map PDF link annotation
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/9779633.pdfIn PDF document text
    • https://bevugatumuga.weebly.com/uploads/1/3/4/3/134316863/fomebujajimeladotak.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/mojesalivir-poxugamajid-bapovitifeseb.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/e15932e4ad.pdfIn PDF document text
    • https://warajepij.weebly.com/uploads/1/3/4/6/134608856/8643884.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/sajatesawodiji/99190406315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b88d80-b652-490b-b494-ad980e6f4897/cooks_corner_cafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ea2b67-ffca-4802-8116-f4a9fe6d29e1/escudo_de_la_bandera_de_mexico_para_colorear.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/wodabogevujepezokod.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/visisux.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/90356188695.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/english_worksheets_for_grade_4_nouns.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/konidexufanekasodikukamel.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/luruzezefirevesano.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/watch_naamkaran_online.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_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 4936 bytes
SHA-256: 33d400c46349f00c4da5dbb31933f8d659ab6c225438c551f520b5659e2f1ca9
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10812 bytes
SHA-256: 381de017fef8ecdb630e9d086d3b7a698499e2e707fdfe462bf93abf12bda0e5

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