Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb8d76a1b54ee0b…

MALICIOUS

PDF

75.7 KB Created: 2021-05-13 08:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8d7bf8b2739a4d9c6ba5df8be2b25b82 SHA-1: 4b9d2de56e4653e0069afe4ea1084525c7be81fc SHA-256: 0bb8d76a1b54ee0b603b4f3e627b358ee6c65ccabd3393a618770f790661364a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links to disposable hosting and redirectors suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=death+note+2020+anime+release+date In PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/logaf-nosodoxomuwada-zufanipafowuku-turekewafere.pdfIn PDF document text
    • http://lozhobelir.space/82616028857ciqpw.pdfIn PDF document text
    • http://yachts-4-sale.com/guwetomugakoq.pdfIn PDF document text
    • http://roflan.site/ducateur_de_chiens_guides_d_aveuglesummf3.pdfIn PDF document text
    • http://rocketdocs.us/voraxujabumozetegisajotj9j4x.pdfIn PDF document text
    • http://meinekarten.best/dust_sheets_for_sale_ukxhpp5.pdfIn PDF document text
    • http://prizyivnik.ru/60542533204sz093.pdfIn PDF document text
    • https://bokasopuvozanib.weebly.com/uploads/1/3/4/3/134319525/4338162.pdfIn PDF document text
    • http://werategaxa.iblogger.org/corrugated_metal_wall_sheets.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/5222581.pdfIn PDF document text
    • http://blubadgehelp.net/suzuki_violin_book_1_duetsct487.pdfIn PDF document text
    • http://mavito.online/jolaxulevopa71yj9.pdfIn PDF document text
    • http://my-favshopd.online/how_to_reset_hisense_dehumidifierzpeq5.pdfIn PDF document text
    • https://livafuti.weebly.com/uploads/1/3/4/6/134628119/3a0b6.pdfIn PDF document text
    • http://on-arenas.com/47146570395hs5wv.pdfIn PDF document text
    • http://study-english-05.site/which_direction_does_a_furnace_filter_facecgits.pdfIn PDF document text
    • http://fortuneo.biz/fufukikerususzrtl.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/c6b1b34e-eb00-4f62-8e36-f9d25cc8ada6/can_melee_spell_attacks_crit.pdfIn PDF document text
    • http://tuzajobiwazotuf.epizy.com/58283926378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac230596-2280-4ce0-aa30-35719ce58875/ovids_metamorphoses_daedalus_and_icarus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db15207-a529-4301-aaa0-d51676ee7087/alex_rider_russian_roulette_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1170217f-5982-4f7a-8961-70b2759e2cd3/buzifovasi.pdfIn PDF document text
    • http://tomoguwotikumux.rf.gd/67121531934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2f402f-22cf-477b-897c-f3fc3419d2d4/how_to_reprogram_a_hunter_douglas_remote.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 5336 bytes
SHA-256: d7467b415e66eef373215a41062125b4131c496c7837b71c8981f78b93bf7a38
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 10648 bytes
SHA-256: a6543c434a8b55e17c8abd2dcb0630b01dee8854806a5c5dc1f6bd796ce977f4