Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2616757ab682de1…

MALICIOUS

PDF

62.3 KB Created: 2020-12-21 08:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c3aff2d22b049c6a81730b4270893888 SHA-1: 6180b28395a5293aae1c45844a84004d471d3e92 SHA-256: e2616757ab682de1a45915c85669a97dc1b0ece9381018764b8e3e8227e7a07c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various websites, many of which are hosted on link farm services like Weebly. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/strik?utm_term=beautiful+scenery+wallpapers+for+mobile In PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/nomoxopakuwez.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/4556020.pdfIn PDF document text
    • https://pevumufaropis.weebly.com/uploads/1/3/4/7/134706438/lopatiz.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/5fbce344be7cfc36344e8aaf/t/5fbf536ffa04221c71172b00/1606374256030/the_fosters_brandon_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638415b4-697d-46d2-8dfc-41e5ac07db60/samugerevesowapamavemiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5bc2ed-3dae-41a1-847f-3a71c1951d99/91788598694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da95fada-c2ca-40d0-9bb4-b1b97e147a7e/hugh_jackman_world_tour_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46d3702-06ad-4643-8bc8-9453d4b1d8b4/67591165246.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd19809eac5d50e5691461/1606228352931/a_dogs_journey_book_reading_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9613c8e-342b-4ac4-b48e-55f459d4f12b/lepasobalabujif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51de668612547ed794755/t/5fcacde11880ce05e83d081b/1607126498092/70271967809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3921c6ee-a734-4052-95f7-f6bd5a3fab95/59618560080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37498620-2524-4917-88ba-a6e1bc347da6/bojizogijebiwobukavarowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4089677-d50d-46fb-a3c2-73fd76e6e1fd/jubopevatedilejifomegik.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_off0000b5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FF 5544 bytes
SHA-256: 30f576aefa21845e308fb77f0025d2c25e213ab8eb8fbd4b5cba63980628ec26
font_01_sfnt_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 10644 bytes
SHA-256: 1d23f2e90c6d2e000d9001fa2cb6e4440a9004d83c274c57fa8e83c294c4b351

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