Malicious PDF — malware analysis report

Static analysis result for SHA-256 32516545efb13d8d…

MALICIOUS

PDF

74.4 KB Created: 2021-03-21 11:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 24390d03c67420851ba9fb508b856bd2 SHA-1: a18b58ac6fd07c55d67dba6ad52ba70910151760 SHA-256: 32516545efb13d8d565368280fd82841dcbe2369b51d638cd89b6c5b3cf47afd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=bailey+and+love+27th+pdf+download PDF link annotation
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/2033860.pdfIn PDF document text
    • http://expressvpn.store/bikejerukolanewuzujosh5cet.pdfIn PDF document text
    • https://zovijopafirol.weebly.com/uploads/1/3/4/6/134630452/xuribamurorevatafi.pdfIn PDF document text
    • https://cdn.sqhk.co/pimabosi/jgitJgn/idle_ship_tycoon_port_manager_mod_apk.pdfIn PDF document text
    • http://changepass.online/zavitadg1q5c.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/jigTMGl/build_battle_server_code_minecraft.pdfIn PDF document text
    • http://hardcreditcheck.info/how_to_clean_my_hotpoint_oven_door2rr80.pdfIn PDF document text
    • http://help-service-support.com/tomtom_n14644_resetdt06x.pdfIn PDF document text
    • http://romeita.fun/98013688821kipxc.pdfIn PDF document text
    • https://xidelora.weebly.com/uploads/1/3/5/2/135296398/fizuxuzo-silevimunedam.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/eoNiiGg/key_leader_led_garage_lights_home_depot.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/abe3c154-80f4-4eb0-9736-fc898345976c/guvakorevitipijamir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a463e52-bdae-44e9-af0e-e95cbbc96112/73161485730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9dd15e-a026-48f0-9535-8be1c03c3f63/nedisagasometa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139d8c77-600f-4ab2-b568-db4e5d05448d/8276712706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7f0ba9-dbd3-440d-aa7c-5c965631111e/the_drummer_boy_of_shiloh_collections_book_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7ac526-18b9-417c-92a5-b11bb901539f/how_to_convert_2d_to_3d_in_autocad_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49c6da6-5754-4a61-a176-65cd0558eb20/48363880627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0cbfd3-a25b-4299-97b4-29892a505a3a/present_simple_present_continuous_exercises_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a833ef00-af00-4c34-9cb3-b3fa85af008f/tax_rules_for_rental_property_depreciation.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_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 5368 bytes
SHA-256: f216413492b5cd76a1ea0fb4ae9a56b3ec655029a81e88e8ddb0e099b31041d3
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10748 bytes
SHA-256: cbd82ad9b05c13c97238f4f80b0fe22b27dc606625e4137ab151a72f5f4d3494