Malicious PDF — malware analysis report

Static analysis result for SHA-256 387786b0e82f59a7…

MALICIOUS

PDF

93.3 KB Created: 2021-03-31 01:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cff3dfc61feb7694fa683a1f967c8d8 SHA-1: e3c0dfd88acc9a8a772d3c8a8f565d0ad3c9aa6c SHA-256: 387786b0e82f59a79749d7b450f6a61fda14f0a7faa3ddcf2271e8ac952fd07b
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, with one specifically pointing to 'maypoin.ru/award', suggesting a lure for phishing or credential harvesting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable domains, reinforcing the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=funcion+de+la+hormona+adrenocorticotr%25C3%25B3pica+pdf
    • http://daxavepevepa.mypressonline.com/28429198499.pdf
    • http://cocobeautybar.ca/wodonaxudovewutagiguj88zn3.pdf
    • http://wilidelefuguki.22web.org/cnbc_market_guide_free.pdf
    • http://jeruxawi.iblogger.org/echo_weed_eater_parts_srm-210.pdf
    • http://wegaturagifo.getenjoyment.net/what_is_the_best_call_blocker_phone.pdf
    • https://cdn.sqhk.co/wuladupuzo/Wgcgf9O/lonely_planet_new_york_city_book.pdf
    • http://hookup681.site/why_is_my_hp_envy_5020_printing_blank_pageseszl7.pdf
    • http://lojasamericanasbr.com/ceramic_craft_suppliesbf9lj.pdf
    • http://zogiwajuvuda.22web.org/free_printable_venn_diagram_template_with_lines.pdf
    • http://tameenegypt.com/cheesecake_dexter_gordon_sheet_musictxf5r.pdf
    • http://gexomafe.mypressonline.com/wind_in_the_willows_picture_book.pdf
    • https://cdn.sqhk.co/zepipawetopi/giFV8ge/tiny_bubbles_laundry_baldwin_ga.pdf
    • http://mopowataxix.medianewsonline.com/41732900174.pdf
    • http://xikapajami.mypressonline.com/vakos.pdf
    • http://susekilimu.medianewsonline.com/dizonaraxosozuweziwu.pdf
    • http://womizepivilora.sportsontheweb.net/tuliranixorapafapusuz.pdf
    • https://cdn.sqhk.co/zibepidok/dEjfagd/18564437054.pdf
    • http://nakozek.mypressonline.com/airbus_a350_cockpit.pdf
    • http://dalifajebuxog.scienceontheweb.net/primary_mathematics_2b_workbook.pdf
    • https://cdn.sqhk.co/dagozuwemep/c9jZJ9G/pavoxamexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nezugetojuf.myartsonline.com/marofumivifilavizuba.pdf
    • http://sibaxelori.epizy.com/buku_agama_islam_kelas_10_penerbit_erlangga.pdf
    • http://pabewuvuxaf.onlinewebshop.net/xirivufiropaxalame.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115ce.bin
777b4c04c353cffbfaaee9d9de637e0da126f7229dc9284873382f63f7d9ee9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 5308 bytes
font_01_sfnt_off00012773.bin
69ca6a971af34cb3634fadbaf7e5e6067149bb68063a47ec8cff9dd2299dfc0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 12432 bytes
font_02_sfnt_off00014f8a.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8A 16204 bytes