Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd6e6543df6d409…

MALICIOUS

PDF

80.2 KB Created: 2021-05-09 05:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5da105cc9d4cb9e1c43d9a90c3e676a SHA-1: 78dfe98f8055115b97e8531426409c4dce13b5bf SHA-256: 8fd6e6543df6d40905d25976a523259e91e5e130755bdba7a43a0b0a33dc37f2
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in the URLs further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/strik?utm_term=probability+statistics+and+stochastic+processes+pdf
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5fd2eb16792a3.pdf
    • https://cdn-cms.f-static.net/uploads/4461481/normal_6032e6cde03d4.pdf
    • https://cdn.sqhk.co/wavudasawete/ziegehe/breadwinners_menu_prices.pdf
    • https://sexaximelukifa.weebly.com/uploads/1/3/1/0/131069869/3753481.pdf
    • http://dewobazul.22web.org/briefings_in_bioinformatics_publication_charges.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5ffd2d95a315f.pdf
    • http://biomanix.best/graphing_systems_of_equations_homework_answers2og9j.pdf
    • https://cdn.sqhk.co/gevajoke/D65Dgda/dune_book_series_box_set.pdf
    • https://mavilefisubagar.weebly.com/uploads/1/3/1/6/131606233/zeweluxetewuvu.pdf
    • https://cdn.sqhk.co/bitowiso/gihagcB/turbo_skater_race_starsector.pdf
    • http://instapodarok365.site/the_5th_wave_series_movie_sequelkqhnd.pdf
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/7492588.pdf
    • https://cdn.sqhk.co/tatiwurixiwo/hgggRKX/software_data_cable_qr_code.pdf
    • http://testersairf.xyz/90549827222943ji.pdf
    • https://static.s123-cdn-static.com/uploads/4368978/normal_5ffdd73fb3303.pdf
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/7966939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jopinewo.epizy.com/du_monde_entier_blaise_cendrars.pdf
    • http://davupuvaf.rf.gd/mankiw_principles_of_microeconomics_6th_edition.pdf
    • http://weguxaja.rf.gd/cuisinart_14_cup_coffee_maker_charcoal_filter.pdf
    • http://dalizavok.rf.gd/kolofup.pdf
    • http://vojapexa.rf.gd/73904071818.pdf
    • http://vadawowugozopul.epizy.com/merchant_of_venice_act_1_scene_3_questions_and_answers.pdf
    • http://runumebutevota.rf.gd/51119095483.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd71.bin
0044482c14b2ad774aedf644cc3a3d3ff58312e41519b533b3fd2d22cb67008d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 5484 bytes
font_01_sfnt_off00011013.bin
a345e89f1046e2be6623a6d1fbfd629e6eddee6abb000c4f1ff276b3563c267d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 10264 bytes

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