Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad26985d1fc2eeb5…

MALICIOUS

PDF

132.4 KB Created: 2021-02-21 09:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d42378e37b577b58ad84a8cfc354f586 SHA-1: 5db968f688738ea0a607a0b311f51f57ea00fb9e SHA-256: ad26985d1fc2eeb57d4c9bafdeaeb81efa68eaf69c430712173db7c4bdf902a2
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV heuristics strongly suggest malicious intent, specifically related to phishing and potentially malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+gothic+style+architecture In PDF document text
    • http://blognews.top/472986011108tuw6.pdfIn PDF document text
    • http://4escam-bot.online/71983311494r98pn.pdfIn PDF document text
    • http://about-igsupport.com/what_is_the_48_laws_of_power_aboutl6fea.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/0ae64f197658.pdfIn PDF document text
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/3739574.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/woneretajilunevefi.pdfIn PDF document text
    • http://robolab.one/riluwovudifukezidujeg30mr1.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/liwetodopapazej.pdfIn PDF document text
    • https://walikuroxora.weebly.com/uploads/1/3/2/8/132815001/kapitudozefutivasik.pdfIn PDF document text
    • https://guwizufim.weebly.com/uploads/1/3/0/8/130813931/lafifinogelita-vopaj.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/vukumesoj/13320336900.pdfIn PDF document text
    • http://gizugutopaf.epizy.com/kuzimutovafatubiv.pdfIn PDF document text
    • http://tamemesile.rf.gd/vuviroloziz.pdfIn PDF document text
    • http://livofikozenaduj.rf.gd/decorative_aluminum_sheets_canada.pdfIn PDF document text
    • http://madepug.rf.gd/10072093099.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/authentic_assessment_definition.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_off0001c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C547 5176 bytes
SHA-256: 7e2261d7bfe1a77eb32b38633d6bb834d25c5b7ce1a3d5aefaf487de1d3ebd1a
font_01_sfnt_off0001d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6F4 15444 bytes
SHA-256: a5875451eef91492b74a3ccd8e9be2a220393cda23ff6e1ebc082f62d3dac262

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