Malicious PDF — malware analysis report

Static analysis result for SHA-256 b113baef2811f8ef…

MALICIOUS

PDF

78.8 KB Created: 2021-05-29 03:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d27972ef92b91abab09524893980e62f SHA-1: 6b2ec731a6d99e068caf4ed629ee6f4edb205c46 SHA-256: b113baef2811f8ef77715678fe4899f58ad91a2dea8ca5d6617bdf678bff8a08
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 0.9993

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://nipisod.ru/123?utm_term=broadsheet+sydney+restaurants+cbd PDF link annotation
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/kezisifimugikamo.pdfIn PDF document text
    • https://gufevetiginuz.weebly.com/uploads/1/3/4/6/134626386/7579690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fdac69bec988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_602a35e644f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_603b7946145cb.pdfIn PDF document text
    • https://sixamipad.weebly.com/uploads/1/3/4/7/134726782/raxavajozir-guveg-lufomiw.pdfIn PDF document text
    • https://fufagefi.weebly.com/uploads/1/3/4/6/134638184/6213951.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/5603534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_60451228a1ead.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5ffa93084de1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_606ded73bf9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_6038e76423fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_600ad68cec7c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393028/normal_5fe07fb414a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_6060eb59cbad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_5fd2863329542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_605bfd20a62d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_605447932ff78.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/2b5d921a-af3f-4ffc-a7fc-c72d3473ed51/how_to_turn_on_pilot_light_on_ideal_boiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe177e5-3a25-4714-9d55-7b3811e11758/how_to_make_cooking_oil_spray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a61b064-9129-4e17-a328-5661d1538c09/my_att_u_verse_wifi_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6d3aef-5341-4eb2-9d55-a2e223d98bed/are_1st_edition_harry_potter_books_valuable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f83055-8b6c-4dd3-b6cd-b84f60c9394b/vertical_jump_bible_workout_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d710618-0b19-4be5-b5b2-82589f737a3b/nowixukilofumipavosoka.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_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 5288 bytes
SHA-256: 74540f9aa9884fabc12444875ccbf79fec9ca0c3f7e0d41093cec43dfb4f2b43
font_01_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 10828 bytes
SHA-256: 8ed4511d61610c0c8f1cf12bb69a9e6a71db724f8972f834cb3e4cb55c6c8e67