Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce12cfb8e1905bf…

MALICIOUS

PDF

81.4 KB Created: 2021-03-04 23:06:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d36e6b0839823239672aa8a9d0e4c7e1 SHA-1: 15f03a2653447df994d92367bd04825a75c99e98 SHA-256: fce12cfb8e1905bf641988f6802ab0b6c137c40d964446559eae0b26e3077322
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=what+does+pr+and+marketing+involve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445573/normal_603435d9db79d.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/dont_you_think_so_meaning_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fe6502035035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5ff8896e049b9.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/2019_lexus_rx_350_f_sport_lease_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_60251956e3b04.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/samsung_wf42h5200ap_a2_filter_cleaning.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/04bc0968-76c5-4f3e-a28e-608d3fba0865/how_to_unlock_a_dewalt_compound_miter_saw.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/what_is_the_feminist_legal_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c67004-d681-4bdf-8f96-90fb03ddb751/dezukijaniraxa.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_e567dd9f78a1409ba23c2bb1b69ba810.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/43861608314.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_60987525c300413a9138f20762bdce7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdab1bd8-0625-4700-a237-f52c4d5e5415/71760226821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61452832-47bf-43b2-9ff0-e71f1e050367/85804913828.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/76146462364.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_48ad2840b796401fb50435e33c9bee97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1ea22b2-47ca-4ddd-b87e-1205ea5fdb7c/zebuxewemegepuwawuji.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/imagenes_de_caritas_tristes_animadas.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_058dc57782e5425a8efc861afa19a4e4.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_a822d20c227c4481915d3c2fa5a24355.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/xaxurelo.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_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 5508 bytes
SHA-256: f4c3abc25ac1ec005fc2836da5fbf2f49559889d07ed99cf955530903dfdcb5f
font_01_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 10064 bytes
SHA-256: e7d7a285455b074263879d187062b75dd42ba7c2ea6b0cb937741185c2198272