Malicious PDF — malware analysis report

Static analysis result for SHA-256 819fe8f18f4f5f9b…

MALICIOUS

PDF

72.2 KB Created: 2021-03-14 05:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c029e4ddedd3198a620243dcf034d309 SHA-1: 5809ff788f88de217dac9f79845a0504e5026693 SHA-256: 819fe8f18f4f5f9b9839a5a5633d4533a7749f3202a22c1b6af760d9e203c3b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://xezojetit.ru/123?utm_term=app+store+review+guidelines+games PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ff3be2f3e8dc.pdfIn PDF document text
    • http://cosmeteca.com/htc_one_mini_2_price_in_nigeria4vsvw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5ffa73be4aa8e.pdfIn PDF document text
    • http://ipatovaalena.ru/zofuloranozusogvmr4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5fc94fcb8f1a6.pdfIn PDF document text
    • http://thedefenseforge.com/98682052219c0muh.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/67309060401.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/french_numbers_1_1000_in_words.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/tabla_de_conversion_fracciones_de_pulgadas_a_milimetros.pdfIn PDF document text
    • http://ecoterritory.store/do_trane_ac_units_have_a_reset_button39b68.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/pokemon_fire_red_cheats_emulator_gameshark.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fd7b71ee53f6.pdfIn PDF document text
    • http://livethailand.fun/887917286388ae32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc5e804e2281.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/26957345204.pdfIn PDF document text
    • http://teplotronic.ru/drinkwell_pet_fountain_replacement_filter_cartridgestfi8r.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/3a24c225-0b78-4ee4-94b2-6b80797a6e2e/behringer_xenyx_802_recording_setup.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_204de71a4c0b4a189afc5fb789052f0e.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_3c54db1eec5b46a7a0df3268468ca08b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ccacc02-51e3-47f1-a8b8-e4fadd5e6e7b/sansa_clip_mp3_player_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111f4b98-0ff9-4a89-bd3c-433168d09705/tempest_in_a_teapot_meaning_and_example.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_7cd16d9170184752a823e8377ad5733b.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_0b8b023c48954713b33cf3a4b453918f.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_c63b8267e5be408ea714b97dafe6dffa.pdf?index=trueIn 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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 5420 bytes
SHA-256: 593afd7db8a3f178a2feabf9c51d1d85758867fcf63ceb748d478ad209260d14
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10884 bytes
SHA-256: 3a9a95c5c38c7c51aa38414ba17f220d09d73155235be3c3fc4f3fadd4b34c34