Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca85d1fcbce8e21a…

MALICIOUS

PDF

82.6 KB Created: 2021-02-07 08:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 85900ed561100c776ec333b83de9f426 SHA-1: 30f0c5ad625f16896f26640acecaab42420c7dec SHA-256: ca85d1fcbce8e21aa1e905c0940621d601c60ca28b8c5b8d97497e10b18b2b43
186 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

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://maypoin.ru/wb?keyword=father%20of%20the%20year%20parents%20guide PDF link annotation
    • https://mogimefiledewe.weebly.com/uploads/1/3/1/8/131857364/22bbf2ca.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/nekas_ruxufudila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fe303abbe98c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494875/normal_5fe03186c535a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_6012627397dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_5fd2181720313.pdfIn PDF document text
    • https://tedejewudokas.weebly.com/uploads/1/3/1/0/131070167/dajuwarek.pdfIn PDF document text
    • https://likeledizu.weebly.com/uploads/1/3/5/3/135312051/52841.pdfIn PDF document text
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/8497782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5fd7d5cc91f77.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/4128034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_6014ac327f36e.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/linonugelelil.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/2668079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fdbdb240dab9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/adder_snake_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/37559472626.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/christmas_card_template_photoshop.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_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 5328 bytes
SHA-256: 432139960b8520cb1c8202a370dcbf06d7080579b62252137095887bd9fa94df
font_01_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 10148 bytes
SHA-256: 6be02eced01216f103844e4bba0e519f913bd8439c4e7b0df12b608a2d1921af

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