Malicious PDF — malware analysis report

Static analysis result for SHA-256 f023cd12663f3a42…

MALICIOUS

PDF

78.4 KB Created: 2021-05-18 16:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e8e001b6b1595056767ebe41903cc9ab SHA-1: 565358582b85a4e6676a3b63c36acc90334a9255 SHA-256: f023cd12663f3a420a9491f234954fc051b6413414241c5f49ae85ce633496d1
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 0.9996

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://jumiwimov.ru/strik?utm_term=how+to+mod+borderlands+2+xbox+one PDF link annotation
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/zoguvu-rixofipe-damiwira.pdfIn PDF document text
    • http://tonivatibiri.22web.org/market_leader_pre-_intermediate_practice_file_answers.pdfIn PDF document text
    • https://rosaguvedofim.weebly.com/uploads/1/3/4/3/134352906/b6a0497cdbf9d3b.pdfIn PDF document text
    • http://voduvalegef.66ghz.com/cns_and_pns_worksheet.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/8115405.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/pujofotixiri.pdfIn PDF document text
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/61f81ab00514.pdfIn PDF document text
    • https://xiriwedonup.weebly.com/uploads/1/3/4/2/134265341/634888.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/8235115.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/97ade02b-195f-4e53-a9b8-a17dd261a018/37064556384.pdfIn PDF document text
    • http://jomobagezib.rf.gd/the_metabolic_syndrome_prevalence_in_worldwide_populations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6117c20d-0b35-43a9-8b51-f91f4ab45ffb/99479058737.pdfIn PDF document text
    • http://vuzajakexe.epizy.com/icao_annex_17_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4dd173-de0b-4eaa-a331-ee8ba4fb46ab/jack_and_the_beanstalk_book_review_ks1.pdfIn PDF document text
    • http://fanuxifesuz.rf.gd/what_is_a_good_a1c_level_for_diabetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa44b3dc-0444-4eb0-8e5f-9d57674a1b8d/penoriditedoxodune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc0b179-a7a4-439a-80f0-808b3c1d78a8/dedujidefolotedanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfdb6a3-9e42-4c23-8b7d-1d7f845350c5/keurig_k40_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4287fee0-31c6-4c77-9541-3f484782235b/bukamefekekiwatekitip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b6cf25-ca24-4914-8975-363350e8b024/nagivoxazaganuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1df08a6-384a-4cc1-81f5-7d37dc7b0d85/86698001512.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_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5364 bytes
SHA-256: 2b8ddcc19c082155b75210299f78e048a950e015bb5aca777ad4583481d7ff49
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 12244 bytes
SHA-256: 88bfcd09fc8dcd170be50b406c0452851099084a508929f441bd0b0827485632