Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d782906ea3e37a5…

MALICIOUS

PDF

79.6 KB Created: 2021-03-26 09:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1f9c53bea889fd7fcfb2338a124a0a4 SHA-1: 08fb39766173b848cbf86facaa20130550b0b00d SHA-256: 5d782906ea3e37a569fa83475b5ea962e5bf4595d26eb808a895c7abd22bf127
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 0.9957

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://leonvi.ru/award?keyword=english+advanced+vocabulary+and+structure+practice+key+pdf+chomikuj PDF link annotation
    • https://cdn.sqhk.co/gamakokub/hgjf4hd/86956331384.pdfIn PDF document text
    • https://cdn.sqhk.co/bisozowinala/iiYnJB2/77157936556.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/cual_es_el_proceso_de_investigacion_cualitativa.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/idkRXIb/sound_level_meter_measurement_procedure.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/I8hjcih/voa_khmer_news_radio.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/geiiwif/idle_arena_evolution_legends_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/UjbnggC/baby_yoda_stickers.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/paxokolades.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/iaPBgY2/golden_spike_salt_lake_city.pdfIn PDF document text
    • https://cdn.sqhk.co/neluxuxad/iS0ige6/ad_agency_website_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/hfhgGOW/well_versed_in_a_sentence.pdfIn PDF document text
    • http://dedigevobunobe.medianewsonline.com/are_you_addicted_to_your_phone_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/Mhbieib/kedifisobov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_b08915e46a73417a84c03540b1364fe3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/37055211913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecafe30-0163-4c5f-942f-c52ec9cf0660/psychology_the_science_of_mind_and_behaviour_passer.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/36551370470.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_7428e8545a3948bf823a182a7afb17a5.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_92d37ff1e77446cd8a2732c762cad503.pdf?index=trueIn PDF document text
    • http://kulebosux.myartsonline.com/the_lottery_theme_statement.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/college_algebra_with_modeling_and_visualization_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/fuvufovolu.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bannerman_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/fireworks_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6f0d12-c9be-48b6-a288-389b64625eec/what_is_the_best_haircut_for_a_black_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f003bf0-014d-4af5-87b2-08ec47bbae42/57467644943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae647bd-eafc-425f-b59a-337f000887dc/43407305977.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_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 5968 bytes
SHA-256: 02f4d865e7fe6d2abc9b64cf9a9642c584e1399e555f18ce1098111f5d06590e
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 19188 bytes
SHA-256: b025894c31780cd7dcc0102a50063bba3168eb94f5393a7b8bc0db793eff4499