Malicious PDF — malware analysis report

Static analysis result for SHA-256 279fdaa3c12452af…

MALICIOUS

PDF

76.0 KB Created: 2021-02-21 12:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5b4ef29e4a795b22901e295b486be79 SHA-1: 86ac42b2ed467b0988875345d53e84eb41398279 SHA-256: 279fdaa3c12452afa15915aa9dae6f88831b12df66a093d16575142d9fdd5997
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/strik?utm_term=reaccion+de+combustion+del+butano+ajustada In PDF document text
    • https://cdn.sqhk.co/xewafazuk/jjEtifq/36785231499.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/juzemiwizuni.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/rosusas.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/h46iaJn/temas_para_plus_messenger_apkpure.pdfIn PDF document text
    • https://fogufapepupol.weebly.com/uploads/1/3/1/8/131871477/beboruf.pdfIn PDF document text
    • https://cdn.sqhk.co/deguxikezu/dhjgf2T/64373296593.pdfIn PDF document text
    • http://kyhni.site/employee_engagement_hr_projectnmuhf.pdfIn PDF document text
    • http://persequen.com/50688472309bzofi.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/iddqkyy/phoenix_arizona_population_rank.pdfIn PDF document text
    • http://pl50off.info/civilization_3_for_androidskcva.pdfIn PDF document text
    • http://matalake.22web.org/56057355547.pdfIn PDF document text
    • https://dixevivoruze.weebly.com/uploads/1/3/1/4/131437918/a4b89e390301e6f.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/giihnji/tivofetugoj.pdfIn PDF document text
    • https://cdn.sqhk.co/gidowoji/Hibesib/xufelevakemexan.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/fib8hgJ/dakipisidogakod.pdfIn PDF document text
    • http://triple-doska6.club/merafujumavoguvuzinalejigt1wz.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/vygcsC5/fuwanukibo.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/robumuduluwise/23830834130.pdfIn PDF document text
    • http://tobitutivarod.epizy.com/cg_iti_online_admission_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/pifininabowabuxunifujove.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/another_word_for_personal_information.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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 5212 bytes
SHA-256: 49d8afe604f14ad4094af1f882def2b498eae9078cedd2f0188dcb8d4adb8800
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 12968 bytes
SHA-256: 5e85fd62d778ab6f680ed72678b85c68582ddac43aeb61805d0de63dc6c276c6