Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d08cc36b4a495f0…

MALICIOUS

PDF

75.7 KB Created: 2021-03-19 21:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bc1e16b1ff4a6cf13fc61a9b8549ad93 SHA-1: d00ab244c63f4260ab82446833f6b349a584ff97 SHA-256: 5d08cc36b4a495f0ba119880d3d31da1d25f72e257c33b8a55d1389eeb9276d9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF point towards a spearphishing attachment, with the potential for further exploitation via embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=sodastream+replacement+canisters PDF link annotation
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/makunodisatixir-wofowedi.pdfIn PDF document text
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/ronomelowotum_vugovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_6017d6d0397b1.pdfIn PDF document text
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/8987916.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/8809709.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/18421809253.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/ballast_water_management_convention_2020.pdfIn PDF document text
    • https://fekolulowezomo.weebly.com/uploads/1/3/4/5/134593542/a9d7532.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/5585180.pdfIn PDF document text
    • https://polepufexiri.weebly.com/uploads/1/3/1/3/131379743/5383385.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/kumukukelorepifatul.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/senidijozetago_pedonil_kakiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373753/normal_5ff6501c98666.pdfIn PDF document text
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/lonutodepenojebof.pdfIn PDF document text
    • https://rinavufapakoto.weebly.com/uploads/1/3/4/4/134460237/jefajibud.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/baf4b7367d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/36aa720e-1955-43b2-9cd9-44fc98d708bb/act_book_2020_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5761191e-1011-4982-8cc6-dafcb670f97d/little_fires_everywhere_ending_different_than_book.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/17406913122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f8d6cd-6a4a-4859-bcce-5c32ec5f1f86/what_is_qualitative_and_quantitative_risk_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1061d307-133e-4e3d-9bf5-ea98298cf0a7/sukufajuded.pdfIn PDF document text
    • http://situwosase.myartsonline.com/kibiribawomufuk.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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 5112 bytes
SHA-256: 40a144435ce429d29634d4b1d4667fc30938294f88ae8013b0b86913a03a931b
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 11156 bytes
SHA-256: 64396336922a9b5d009147379d0f6cce5d6cf5a799cc1b6f937708921075d282
font_02_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2