Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bf3c65f9850a50…

MALICIOUS

PDF

80.8 KB Created: 2021-05-14 19:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eab7f7b79f16ed197e3a2477acf17e04 SHA-1: 83843aab223542af0ce2e9b43f8d8432daeccac6 SHA-256: 40bf3c65f9850a500b562fc956379f51dd0da8a7e0cf9af685275432173ea3c6
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=what+is+the+meaning+of+safe+haven+law PDF link annotation
    • http://vosutixovu.22web.org/tedos.pdfIn PDF document text
    • http://wugosuguzef.22web.org/sample_safety_plan_osha.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/bxghPKD/67666645716.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/gusegapipibavevuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/hgwiax9/love_languages_short_online_test.pdfIn PDF document text
    • https://kojazuzok.weebly.com/uploads/1/3/1/4/131438397/nezamojerawujog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_603852f51cf13.pdfIn PDF document text
    • https://fobopogukigu.weebly.com/uploads/1/3/4/3/134366855/2714986.pdfIn PDF document text
    • https://nukubutanedun.weebly.com/uploads/1/3/5/3/135309192/5742439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_60623e6cf2485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_604b850b4327b.pdfIn PDF document text
    • http://kexejadupuna.66ghz.com/project_deliverables_sign_off_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5ff0077a5d1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_5fdc10036866f.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/yjfFb4E/90601447838.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/vemenew.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/4011b04f20f1a9.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/3XghAOk/mini_speedy_hl.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/pedulemu-janemugo-pusunejozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sekuwomexapa.myartsonline.com/diagnosis_of_ischemic_heart_disease.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/one_sheet_pan_cashew_chicken.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/pet_sematary_book_sparknotes.pdfIn PDF document text
    • http://wadepexarupuwa.rf.gd/75275275833.pdfIn PDF document text
    • http://roxonolabixatox.epizy.com/piano_sheet_music_creator_online.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/banulazenovux.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_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 5248 bytes
SHA-256: 5abb5061dd945e00c0eb45558db49058eaf3e9ca13e0041e7752c19caa474f61
font_01_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 11288 bytes
SHA-256: 8340722678df6fb38c095816fa44604cad851a9519b15263216eb8daaf59893c