Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c1bff9ae3116dd…

MALICIOUS

PDF

79.9 KB Created: 2021-04-19 07:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7ba4822d102010c42c7faf483987294a SHA-1: c8c2f40c2db979621a9259bf3a5af6a6c4ff3115 SHA-256: a6c1bff9ae3116ddba64dd362e3ab712beed82732691780bec8cb3f4677741ac
186 Risk Score

Malware Insights

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

The PDF file contains numerous 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust by masquerading as a useful document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=korg+sq+1+manuale+italiano PDF link annotation
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/pekimozo.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/da096baa.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/veguxarofub.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/cK3hcI0/find_my_android_samsung_galaxy_s7.pdfIn PDF document text
    • https://xasonametig.weebly.com/uploads/1/3/2/3/132303127/gorazipuxidiroxino.pdfIn PDF document text
    • https://xajobukemuxup.weebly.com/uploads/1/3/5/3/135398270/4861372.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/67f275.pdfIn PDF document text
    • https://xejoxobufedad.weebly.com/uploads/1/3/3/9/133997298/vavovevuditobumesoj.pdfIn PDF document text
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/8209f7.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/p81Pgde/missile_command_recharged_power-_ups.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_646173157da74700991e865dc36653ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/how_to_move_photos_to_google_photos_and_delete_from_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/emglo_master_series_air_compressor_parts.pdfIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_43b46df97be847fa97b070e4d13438f2.pdf?index=trueIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_294419180a7f4ce3b8dabca29bdd4e6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bdecba5-41f9-4181-9f26-fa1becd3328b/kenmore_quiet_comfort_13_humidifier_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae647e6-091a-4e0a-a8b5-02c43eecf8a9/wabuj.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_694d406bb7554537bb6fdd6da9abc899.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e77206a-3d3c-46f5-adad-b3e29c952da2/33847875892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da128eef-4e47-4cf0-8c7d-783f5684278b/arifureta_shokugyou_de_sekai_saikyou_light_novel_volume_10.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_84dc64c8f28a483ab0b078ead28e436e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/640e9100-3015-4d3f-bf7d-81ce0ebcee32/pibapimelitijoxeru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 2828 bytes
SHA-256: ec0617e7d4b767a4f38c4993bdaaecdad4a8b4ca688b321d2bd370a6bc92076d
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 5152 bytes
SHA-256: 29573ef071d7752ffc01e6e96153899779328b34b35e24bdcf7da0d12040d05d
font_02_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 12180 bytes
SHA-256: d81a7d6ae46a30d870d7fe4efeb3b8b07675e6719e46805d801c50d294369b74