Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdca4e4ac2fee12…

MALICIOUS

PDF

82.5 KB Created: 2021-03-23 23:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed6c6ec138d9f025682765e170b3b6e9 SHA-1: dac6eb430bfee4e2f16dd2321f4a2a45e3d3ebc3 SHA-256: 6bdca4e4ac2fee12c1c5176ea3c81db97fc3f9197f01ea47772c563958e500bd
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 0.9967

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/123?utm_term=lumbar+exercises+for+back+pain+pdf PDF link annotation
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/6218544.pdfIn PDF document text
    • http://glasshookahcatering.com/insinkerator_model_hot_1_parts_manualr8oba.pdfIn PDF document text
    • http://rubyshup.space/zikekedejabekiisa9.pdfIn PDF document text
    • https://nojiwikimina.weebly.com/uploads/1/3/5/3/135315372/sosem.pdfIn PDF document text
    • http://myirn.icu/zonewaxizokkz.pdfIn PDF document text
    • http://nextauto02.ru/2017_ap_statistics_free_response_answers7rs1w.pdfIn PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/mekodozexomu.pdfIn PDF document text
    • http://spiritstudio.ru/gakeremogigonozir53k64.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/dewanugejuzigo.pdfIn PDF document text
    • https://vulotimemoje.weebly.com/uploads/1/3/4/8/134846769/6121230.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/341da798-8b0a-4a95-b687-73f289b65317/tukalemevava.pdfIn PDF document text
    • https://6a543b89-810f-4a07-932c-4cc129fc401a.filesusr.com/ugd/1e5726_0100f6ef1d1e42d5829e1a95bc5d936e.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_ad93f78e86044ddc879bf5d4d52fc2c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/410ef88a-0613-4236-be82-9c311f9f789f/18424442487.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/38057235280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307f8eca-2374-4abe-b406-9d77d08f300c/meyer_e47_rebuild_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/lupumojax.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_19d94dabc51848afb06691bee1fe9e5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/bahubali_2_film_song_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ea3e5b-6ee1-43bb-8940-d3071f81b1ab/medios_de_comunicacion_actuales_y_antiguos.pdfIn PDF document text
    • http://zimemotom.rf.gd/childish_gambino_sober_piano_sheet_music.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_8e19087988c8496797145c4ffcae5221.pdf?index=trueIn PDF document text
    • http://mopezit.epizy.com/angular_webpack_templateurl_not_working.pdfIn PDF document text
    • http://diwokisames.rf.gd/dark_souls_3_builds_reddit_pve.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/indian_camp_hemingway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77852252-b6bd-4aad-a4bd-1a419925b67c/kutapixiwewitobatafoj.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_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 5480 bytes
SHA-256: 67a6db4f1e582ec75b662da7e1f9c23213c99824fdee54cf5a082190a6d910b9
font_01_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 10908 bytes
SHA-256: 4cba3a40d48a43cccf7a101adf53328f5e97bb4d3b17d8b2a181deeca2d19715