Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb9761a77bdd6f0…

MALICIOUS

PDF

81.4 KB Created: 2021-04-28 02:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1cebf6acf4b9611f3aab76a2cf73a6bc SHA-1: 2a7fc3082aff11bd316568e5335eca1961cd04eb SHA-256: fbb9761a77bdd6f0d1f8eafa28769fb9d00a7d48e7516c71e0f2608a2046a60a
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 0.9988

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://dafemum.ru/strik?utm_term=how+to+connect+hp+officejet+4630+wireless PDF link annotation
    • http://zemesod.getenjoyment.net/descriptive_paragraph_writing.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/povufa.pdfIn PDF document text
    • https://fimopoki.weebly.com/uploads/1/3/4/0/134040487/1539691.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/iiujbJU/6236267098.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/jijowevobinasiva.pdfIn PDF document text
    • https://xoniruzi.weebly.com/uploads/1/3/4/8/134869292/mosutimawe-kaxobinuwasiwi.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/tirirafusejavesubokowutep.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/biblia_reina_valera_1960_app_para_pc.pdfIn PDF document text
    • http://center-about.com/72341117524trai8.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/dnsiidD/repost_story_for_instagram_apk_mod.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/pupixe_kepitekow_defite.pdfIn PDF document text
    • http://shimano-stradic.ru/8443496468532lav.pdfIn PDF document text
    • http://cybety.xyz/raku_glaze_recipes_freemcey1.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/what_is_health_and_rehabilitation_sciences.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/iyBja3X/street_of_rage_4_soundtrack_download.pdfIn PDF document text
    • https://sezunugavekavo.weebly.com/uploads/1/3/5/3/135321765/dikajaxa.pdfIn PDF document text
    • http://santecmb-sarl.com/913046983999qfe0.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/bewukepezop.pdfIn PDF document text
    • http://cashfree.store/cosmology_jobs_ukiwm3v.pdfIn PDF document text
    • https://gavibokilixebil.weebly.com/uploads/1/3/4/7/134716725/xisozege.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • https://jasutabaxe.weebly.com/uploads/1/3/0/8/130873915/7258102.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/applications_of_nanotechnology_in_electronics.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/afghan_war_history.pdfIn PDF document text
    • http://telosizaba.onlinewebshop.net/taxovasebagazitawozijofuk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 1684 bytes
SHA-256: 4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 5568 bytes
SHA-256: c478fc3d8568fd1f3da57c3432f91ad7d2f57d9fd87acd52a2d4903cb3b82e1c
font_02_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 10336 bytes
SHA-256: 70524af0d186bf03572a93e30296b2d7c8d8302ab47eaac8b00e5a2cd46928b6