Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4a0689d87441b4…

MALICIOUS

PDF

67.6 KB Created: 2020-12-06 10:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c94ef87641b1038f236fb9d8a75d1d76 SHA-1: 7becd7c609c76c7488bfca3b20bfbc4e2b6f9fad SHA-256: ec4a0689d87441b42ca2abc7d7514d4e2a52d6cbc09fb5dbc2483b36bd029d7f
214 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a redirector link to known malicious infrastructure. The embedded URL, 'https://traffine.ru/aws?utm_term=credit+report+australia+rules', is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure itself contains malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=credit+report+australia+rules In PDF document text
    • https://dopolijakom.weebly.com/uploads/1/3/4/5/134527788/rewomujekovenumowusa.pdfIn PDF document text
    • https://kefanizitadibuz.weebly.com/uploads/1/3/4/3/134328212/46d9125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5ca7b8787e879898d78f7/t/5fcc0473d336b863f0ae1d83/1607206003535/red_rose_wallpaper_wilko.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28fbed26ff1194f7e5808/t/5fcc8e5f7ae85b53b28c173d/1607241312217/boxadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1291e05-4e0a-46be-9cdd-2faa17cad867/73229397170.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/game_dev_tycoon_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/numuxazetimitomusu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc105f69955c744b53c3d2c/t/5fc902b19d61c76d81f8b270/1607008945914/55868270339.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc69aba0b6b03258f5ce907/t/5fc86430970db930d9bfb336/1606968374396/best_tiktok_filters_to_use.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/96227682897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76581a98-9469-4c9b-b8ed-7e7e8f0e69f1/descargar_geometry_dash_2.1_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/vujopelovekubetulojas.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_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 4856 bytes
SHA-256: 713f0f6798b39eeec1d55637534c8f98ba974b6c186705a83418e1c10e3cc132
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 10556 bytes
SHA-256: 95dbe07e5d91a6067312146504eb90ccf12817eb91b84924e0d76b12c5904883

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