Malicious PDF — malware analysis report

Static analysis result for SHA-256 876f2647b270f6d3…

MALICIOUS

PDF

103.2 KB Created: 2021-04-08 21:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4de04992ec0618da555e5f62add4432 SHA-1: 7dd4c6aec63b010ae696ac4387eefcfe277cba29 SHA-256: 876f2647b270f6d39fe829ace961a25a55f93faa830134b84ccc930a51bc7e24
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content or download further payloads. The document body, though partially corrupted, includes a search term related to free MP3 downloads, indicating a lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=fifty+shades+of+gray+songs+mp3+free+download
    • https://cdn.sqhk.co/kupawusel/i4xhdig/12361194260.pdf
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/3b375b7bd2a0.pdf
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/cab3863031.pdf
    • https://cdn.sqhk.co/mugapowejog/gDjh5hi/zixirijanijegok.pdf
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/nuwotu.pdf
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/revum_libox_nawidipilizugik_naduzobijo.pdf
    • https://cdn.sqhk.co/gifitebona/jggivib/xixos.pdf
    • https://cdn-cms.f-static.net/uploads/4426072/normal_601aa12f73410.pdf
    • https://cdn.sqhk.co/vafodagusun/jcRGPdV/pivafakeluzalu.pdf
    • https://cdn-cms.f-static.net/uploads/4446017/normal_60647c5e68ee4.pdf
    • http://mapotilij.mygamesonline.org/astronomy_worksheets_high_school.pdf
    • http://jepegupunu.mygamesonline.org/watojebiparuzosurefexe.pdf
    • http://mazikopipovix.mywebcommunity.org/wonder_palacio_summary.pdf
    • https://cdn-cms.f-static.net/uploads/4414868/normal_5fd829b162056.pdf
    • http://xerujupuje.sportsontheweb.net/philips_lighting_catalogue.pdf
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/nesinup-vopawunikegefek-gikedubes-jisiregupug.pdf
    • http://zukixulen.mypressonline.com/ballade_vir_n_enkeling.pdf
    • http://kazexajisodibu.medianewsonline.com/liste_des_anglicismes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lumosaneja.onlinewebshop.net/pes_manual_usmc_2018.pdf
    • http://pawuzax.onlinewebshop.net/89461493165.pdf
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_a75a9662d30d417fbff8cacbb20caad0.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_392b5746390c4c41b8046140767dc3b4.pdf?index=true
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_05b542158d834d6084a1f695726644df.pdf?index=true
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_3b0443243e384058b63226253dde55e3.pdf?index=true
    • http://wadoromutisagar.myartsonline.com/beauty_by_jane_martin_quotes.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128a7.bin
a9549800c3858be2ad7145a49f32171bc7c346bdc496b97480f383e35e42d1fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 6236 bytes
font_01_sfnt_off00013daa.bin
5eb26e94f09172b6d31efeb4fb42747d7cb8ce843939932b22ab9fd3f799e43d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 5556 bytes
font_02_sfnt_off00015075.bin
227887ea27fbd4477f4023fc7fdb0bc1a1b626c59028639604fb5bd59b6ebe48
pdf-font-stream PDF embedded font (sfnt) at offset 0x15075 15376 bytes
font_03_sfnt_off00017fbe.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FBE 4324 bytes