Malicious PDF — malware analysis report

Static analysis result for SHA-256 614a311bcdd8b4b1…

MALICIOUS

PDF

91.1 KB Created: 2021-03-19 16:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2256a6ebcd58c57e813cf67131e02bfc SHA-1: b28bc3664db72044f164196960f9b4e65a9455d7 SHA-256: 614a311bcdd8b4b16f574ea767043797a07bb706c048d1e7aab100da0177b7b8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the ultimate destination. One prominent URL, 'https://baarspo.ru/strik?utm_term=what+are+the+weirdest+last+names', suggests a lure related to search results or content discovery, aiming to trick users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://baarspo.ru/strik?utm_term=what+are+the+weirdest+last+names
    • http://botefin.medianewsonline.com/redskins_newspaper_washington_post.pdf
    • http://rezokivi.medianewsonline.com/bibliotheca_orientalis.pdf
    • http://xepelewatelaziv.getenjoyment.net/casio_g-shock_g-100-1bvmur_manual.pdf
    • http://jenewazajasazu.getenjoyment.net/zederokomofivebavajuxofif.pdf
    • http://gijaninapumobe.sportsontheweb.net/cvcc_word_list.pdf
    • http://tapopapebesawu.getenjoyment.net/les_miserables_original_broadway_cast_album.pdf
    • http://lulopoboxefon.scienceontheweb.net/how_to_put_a_bobbin_in_a_sewing_machine_singer.pdf
    • http://wabiferofuvud.mygamesonline.org/lijokad.pdf
    • http://tuwukadinem.mygamesonline.org/tutevefezegeferewigefafu.pdf
    • http://fofumumitem.medianewsonline.com/93230379386.pdf
    • http://dizofuses.mypressonline.com/kemenokadolijijajapus.pdf
    • http://fukijuwevo.getenjoyment.net/fudibodanokovibonaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_fac54e2805694119bd3e8cb62f110d14.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc601362-e5e3-4847-ae41-0225248319f5/27412436579.pdf
    • https://uploads.strikinglycdn.com/files/6e678e54-4e2a-45d8-a04b-eafa94c674ba/67964790774.pdf
    • https://uploads.strikinglycdn.com/files/5b6376c6-592a-4610-8e7b-17f42b925e87/mi_planta_de_naranja_lima_resumen_del_capitulo_4.pdf
    • http://jinugiwi.atwebpages.com/psychology_dictionary_download.pdf
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_806dd31579e74c04a480314b523144d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55e50c0b-05b5-42d1-8028-2e421fd3d8a4/the_secret_life_of_pets_full_movie_in_hindi_download_1080p.pdf
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_756ed23785bc46a6b831144c84e51a7f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8ac0460d-36e2-4ea4-9c00-f9911c898820/31077426267.pdf
    • http://nevabaza.atwebpages.com/69224942969.pdf
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_220784df86bb407b9de6c44a90b76666.pdf?index=true
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_4ae989ab6ae0464da75f8251f2f588ef.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_099a324ed9fc420eaa9e39b69d47083c.pdf?index=true
    • http://vidugozu.atwebpages.com/kitchenaid_mixer_repair_shop_near_me.pdf
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_4385af7343f744588a189eaf9734b3cc.pdf?index=true
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_4dce1a2d43ad4e3db88d21a6921f7472.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118fb.bin
f4a0c74f52f72ecc57aa7a2bc1a0a648011c9bef90fe832fe58b016f97bdbe8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 5172 bytes
font_01_sfnt_off00012a74.bin
28277323e542704c787dc035995a6e8b78b96b882c3cc70c46ed52b8a501460a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 2956 bytes
font_02_sfnt_off000136ba.bin
96abe80bed3acfe79c2d2be2297be7fbbf7e65d4351e12bd5081f9fa8798afd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 10996 bytes