Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18a2eebe2c2d5ed…

MALICIOUS

PDF

82.0 KB Created: 2021-05-13 19:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 09d2f4e5b3ac56337272918afd0d6e13 SHA-1: 043eb7f8d69c7b86d587243cc2730c390fdd8745 SHA-256: f18a2eebe2c2d5ed65edaf905b1fa2f3a42ee9cf3dfc9c3126059e7c874013af
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the embedded URLs, 'https://vilenefex.ru/strik?utm_term=why+does+my+razer+headset+keep+beeping', appears to be a lure for users searching for technical support information. The PDF structure and the presence of external links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://vilenefex.ru/strik?utm_term=why+does+my+razer+headset+keep+beeping PDF link annotation
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/guwozozudodorupare.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/spanish_2_textbook_answers.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/5926345.pdfIn PDF document text
    • https://bigidogeto.weebly.com/uploads/1/3/0/8/130874652/5993643.pdfIn PDF document text
    • https://kijidagidopijub.weebly.com/uploads/1/3/0/7/130776406/5694238.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/8997e6.pdfIn PDF document text
    • https://lisesadavageg.weebly.com/uploads/1/3/1/4/131438313/7701d92d8b0d.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/68119082227.pdfIn PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/290563.pdfIn PDF document text
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/8288984.pdfIn PDF document text
    • https://vaxamapex.weebly.com/uploads/1/3/4/0/134017084/f8643.pdfIn PDF document text
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/9243728.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/91602a4b-4e76-4f3a-865f-6b37f56e81ef/mekadobowafebukuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb28dc07-2632-44be-bf41-2174c7cf6b9f/36540316366.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/fafefuvepapedofipodetep.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_e90f145c4a1643a79b1ef74831f87566.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15d34d1-56f9-4ab8-beb1-a60d7e533718/duxepuxatasaxixexobi.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/auditing_and_assurance_services_16th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7462fff7-06df-4e0e-8142-aa248f24b9c8/100_sat_words_list_answer_key.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_8d7d84ea910242a5923484ca60c76d7e.pdf?index=trueIn 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_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 5712 bytes
SHA-256: 1562822d0281e613de6044fbc1094ad533262467301181f5d83946388af987f5
font_01_sfnt_off000113fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FA 10836 bytes
SHA-256: 846dc0c2ef72f833347c0c972169638bf5756afaf8b2e8a8651dd2bf843bbed9