Malicious PDF — malware analysis report

Static analysis result for SHA-256 762b6159acc9834a…

MALICIOUS

PDF

78.5 KB Created: 2021-06-10 16:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d496002bd3bbd67af67957bd4cef0507 SHA-1: aac4916a620c5f1ba798046fc82b6f7de21574d4 SHA-256: 762b6159acc9834a52574f0743b93b906108333d2e2872c8fb8dad3879599cff
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 0.9990

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://medvor.ru/pbw?utm_term=best+pubg+control+settings+4+finger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404313/normal_604005f176c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_602c42b07c6e0.pdfIn PDF document text
    • https://xexalidifiso.weebly.com/uploads/1/3/4/6/134685587/xivosonuxa-vuwubovikuki-bodugesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_604d6d24646c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_6047203aec239.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489259/normal_5ff6732532ccf.pdfIn PDF document text
    • https://batujesidow.weebly.com/uploads/1/3/4/6/134666028/vovexiwedix.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4458621/normal_60affa1b724b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_5fe185f998135.pdfIn PDF document text
    • https://tuvekowemenizog.weebly.com/uploads/1/3/4/3/134350361/vakoti_kozura_laretifigaveri_zuzirunudiw.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/nunupefosexex.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/66ee6d9292.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/303a5608-beb7-474f-b8b4-cdeb284dab59/84206948151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e639e315-e934-4412-8e71-51a89490ad4a/10285609450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a950c8b-a7e8-4756-8e20-22ca73c79168/what_is_the_id_the_ego_and_superego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38382d67-7c37-44b4-b738-582926f283cb/fisher-price_colourful_carnival_spacesaver_jumperoo_how_to_adjust_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59bd947-6aec-43a9-80fe-83d926154574/peg_perego_john_deere_tractor_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc0dce9-2cc8-4bca-ae36-f0694e279170/57330003320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e98077-4d7b-4bed-a264-f297c0c73d4f/59606590808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abe9638-2c85-4c16-8849-6e0acc613cc2/magic_chef_mini_fridge_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2b0504-eefb-4bb8-9a0a-c188c729faf5/93565615623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc87605c-cdf9-4990-a1ca-badb08e8a304/66888820589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4887c6b3-b3ee-482c-812a-a2d46c13f020/violin_scales_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9364d41a-f7df-4260-9c71-71da42c4cda8/tafozaxe.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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 5132 bytes
SHA-256: 73afaa603b0dc781351013650d517706dc2c477d34a91bc0a770951012f99f38
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10516 bytes
SHA-256: 39f4dbbe1ab5e5fdbf45e9e818106692bbe00275014e557517d88e6be0c06809
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c