Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1875643b16690b9…

MALICIOUS

PDF

71.5 KB Created: 2020-12-19 05:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0306e54e67296105b0867101e25e1e46 SHA-1: 0a78e2ea9815a141b8feb70c1ceb4bdc1e95c262 SHA-256: a1875643b16690b912673b69c74e48c32258d66110ed65f3094c1334cd650654
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/strik?utm_term=britax+b+ready+second+seat PDF link annotation
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/seperopogokevedudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425484/normal_5fd2ccde285a1.pdfIn PDF document text
    • https://ketezujozak.weebly.com/uploads/1/3/4/7/134744557/temalenipa.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/456207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_5fdb6af07a8ff.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/judekumereletezefij.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/3603842.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/8f0ce282-2082-4c9b-92ef-fe90eccd5ecd/10778751846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85566872-076f-4adc-b7b8-da2b112bd631/rebixemifixifik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabfde02-8078-4f87-9e9e-04107e64027a/8887007421.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/beautiful_baby_girl_pictures_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a97757-5e5b-413f-acc0-0fc4bc92723c/48246284681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fff276-7266-4860-8e5b-f276df61703b/81301079727.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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 5260 bytes
SHA-256: 780f83794133875b4f0c609fa153220eb689804c12984997f7f4ccc6636b61ed
font_01_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 10648 bytes
SHA-256: 5f81de0175ac9ed6fc657c19e34a9313501625a70c329ece9052c09402202e4b