Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae9527c359e53c4…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 12:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f92f6137b1d589909799d960ab8d1956 SHA-1: ba3af3afc6254a883ae299aa0ea353b1f5a1f2cf SHA-256: 8ae9527c359e53c453fd45242b23074751671dd3ab01666a724ffe959f9a8a83
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to 'https://traffset.ru/strik?utm_term=quimica+inorganica+descriptiva+rocho'. This URL, combined with the document body's deceptive title, suggests a phishing or malware distribution attempt. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting this malicious intent. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=quimica+inorganica+descriptiva+rocho PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5f87de14bab8a.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/wajebegowa-nerete-tivor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_5f9668235ba2a.pdfIn PDF document text
    • https://dinomorozowi.weebly.com/uploads/1/3/4/6/134610364/7491893.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/9546664.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/72fd7b53-06ae-4898-ae0f-a3be41b1dd32/tibunujel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ac3c46-5fdd-430e-b04f-76514246332f/elevate_lompoc_treez.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/husqvarna_610_viking_sewing_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06856a54-3aa0-495b-9283-fdd8ed14e69c/kurowodafudilezabezexus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552a4a23-b47a-44a8-8ccf-996cb87a3f83/danes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38838efd-21cb-4932-8fff-71e73d9c6d07/22835368689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afacbeee-79ae-409c-af5b-6ed30762d4ad/67451782192.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_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 5576 bytes
SHA-256: 40b42393717b7af8e976741f736f701727ea664000d4388793cbb4d1ff06e616
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10980 bytes
SHA-256: 8660595b0160400dcdcf051ab51a9d06906ee4f65ab79799f02712c006f5068e

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