Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fd276171a3bcb3…

MALICIOUS

PDF

78.7 KB Created: 2021-02-27 04:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b85ea8d40d227fa18706f4e349b1c4e3 SHA-1: ca76febd643848215f927a1a5a0b1404da916110 SHA-256: 20fd276171a3bcb368929c8ddfab17bc2a8e6cece26f80c7d31945a35f641fb8
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users. The embedded URL and the document body, despite being heavily obfuscated, suggest a lure related to a Maytag washing machine issue. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=maytag+front+loader+washer+door+wont+open PDF link annotation
    • http://xifadezuzurap.medianewsonline.com/nasinagakogew.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/kizez.pdfIn PDF document text
    • https://vikurevago.weebly.com/uploads/1/3/1/6/131606257/9207195.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/tosomegisepomak.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/the_hollow_bunbury_menu.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/kewasefaf.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/40704494454.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/tataxodutan_lalinidonejebux_jeful.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/50366290538.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/bhagavad_gita_online_free_download_in_english.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/33090319993.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/484eefe87f5ec1b.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/bamusedogera.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/does_hoover_windtunnel_have_a_reset_button.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/yxhcjbg/voniled.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/36349383189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/online_electrical_engineering_bachelors_degree.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/72646572384.pdfIn PDF document text
    • http://zimopup.myartsonline.com/samsung_rf261beaesr_water_dispenser_not_working.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_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 5500 bytes
SHA-256: 675edcc8b6538a9778ec66443a1b3e30d39c95181ba5d2dab107c81f66cd8c64
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 11096 bytes
SHA-256: ee86313bb130062c9fdfb5d5355e4ed5bd5413b107a8baf70a1a9a98a1197b55

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