Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cca95ce77b4d103…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 09:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5b133947257c36c06adabd20d3e51ff7 SHA-1: 7199e7f39feff4e21f75de189ece1eeff755443d SHA-256: 3cca95ce77b4d103741a758313561442a4f8947766b80f3f2b198fea8930ee88
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or spamming attempt, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=adidas+watch+black+red+pants PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449406/normal_602551384a35c.pdfIn PDF document text
    • http://optarfes.com/knock_down_drag_out_crossword4c91u.pdfIn PDF document text
    • http://immorta-cross1.club/14701896842fy0pf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_6029de280f2ae.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/how_to_use_palmers_coconut_oil_formula_moisture_gro.pdfIn PDF document text
    • http://kigetipopizatij.getenjoyment.net/cajas_de_carton_libros.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/minn_kota_riptide_powerdrive_55_trolling_motor_w_i-pilot__bluetooth.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/visualize_this_the_flowingdata_guide_to_design_visualization_and_statistics.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/celebrity_equinox_itinerary_2020.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/zegolewar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_60590aa58ba88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_5fd7eecbef19d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzuxutetug.atwebpages.com/gudapewa.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/walmart_brickseek_xbox_series_x.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_ddc2b83d975648d98d4f15af094bf708.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/xobopaxatawoligubefine.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_8a7d36474229420fac02ba3519c55e6c.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_ed1436ff702f48bfb1e4e43e1f690f1b.pdf?index=trueIn PDF document text
    • http://davofunup.onlinewebshop.net/jenofi.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/wororisupimutubunusegu.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_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 5444 bytes
SHA-256: 01d6f8a0afa1d0829402e8257fdb881189689c9dbf85ee95a4ad17b09a5969d9
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10136 bytes
SHA-256: 7a6d198f10df53e0b679db4261041adfa2a5b1edd4c2a2869ca17b69497e4caf

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