Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f005af536a46b…

MALICIOUS

PDF

71.5 KB Created: 2021-03-21 05:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 21a2fe263a24e46ed8568ba53ce908de SHA-1: a19f5a7abacd5922202d4fbbdd34bb85b751787f SHA-256: 850f005af536a46b32c6d154a39a1bab9eaa74a6630af758be4b9599e4521f1e
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lead users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/award?keyword=alagappan+medicine+book+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480591/normal_5fea2dc821917.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/nopekimutaj.pdfIn PDF document text
    • https://zakikubefetopu.weebly.com/uploads/1/3/2/6/132696201/9836198d5e197cb.pdfIn PDF document text
    • https://tasufevijusenix.weebly.com/uploads/1/3/0/8/130814010/zijasemoram-mutog-lasafuwigelokez.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/nilosaralegiri.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/jiwepuviwixe_lizowine_jaderobose_rageber.pdfIn PDF document text
    • https://larekupexog.weebly.com/uploads/1/3/4/8/134884129/574026.pdfIn PDF document text
    • https://faxufoxexukixel.weebly.com/uploads/1/3/4/4/134455740/xexekexoju_gojotedezunew_dofevividigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fdb5dd02d8bc.pdfIn PDF document text
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/zixolemetawasi_pikivirazu_popafo.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/7614782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fccaad3cd33e.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/e1596ea9779e46.pdfIn PDF document text
    • https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/8880430.pdfIn PDF document text
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/6888131.pdfIn PDF document text
    • https://vebusigatibata.weebly.com/uploads/1/3/4/3/134321359/965389.pdfIn PDF document text
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/basosodigobisulade.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/3564078.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5fc8dcf2ecc37.pdfIn PDF document text
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/wugoxegizalev.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/fcc640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16502112-0c3e-4ffa-ba5a-ef83b6126d43/wenovoxafur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e659f7-a774-44e7-b38c-862908d2db62/337247489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f599c6-d20f-41a8-8bfe-f66c89eb7a8d/how_to_find_slope_and_y_intercept_using_two_points.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 5484 bytes
SHA-256: 8d3c915cdee11bd3a9c96ec6d7079042c4001ba4add53015089a5e68d5305432
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 10228 bytes
SHA-256: aae9ab2608d823f7166c83c190db0f1bba687ae2b2503847a1ddee8929705d0f

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