Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e58ad3dbec5b0a…

MALICIOUS

PDF

76.1 KB Created: 2021-05-07 03:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f397db23b6484e1ad0c73602ec3f3405 SHA-1: 54ca130c0410828ac3e259c5637a3c8061d28a8a SHA-256: 28e58ad3dbec5b0aa65bef1b46edc0ec3746c68d2f24ad70b5ed05f4a08638f5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially garbled, appears to be a search query, further supporting the phishing or malware lure pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=where+is+the+reset+button+on+a+kidde+smoke+alarm PDF link annotation
    • https://bujefodamefizup.weebly.com/uploads/1/3/1/0/131070612/6907422.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/bowixowegogit-degotomupadik-mitadupur-vekexoz.pdfIn PDF document text
    • https://zofekumu.weebly.com/uploads/1/3/4/7/134741387/gusabuginijarul_mawak_vinaz.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/muzidubimubifanin.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/2248551.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/garufuda.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/50940264871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_605384a82a79e.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/17797140825.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/universal_definition_of_myocardial_infarction_2020.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/celi_3_esame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455174/normal_5fdef0c7b80c1.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/5e3a53.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fd78fd0316b7.pdfIn PDF document text
    • http://viziziziv.mywebcommunity.org/91731051274.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/bsc_nursing_3rd_year_child_health_nursing_syllabus.pdfIn PDF document text
    • http://busijizi.medianewsonline.com/jiluriwategibazoxoluf.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/f82fb67c-522b-4bcf-8d4e-386d436f81a8/vaposop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea55fea-219b-44f4-bf65-adde1e9f7c7b/tejedajomoki.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/finding_area_of_parallelogram_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba99be79-501c-4a7b-98cf-ad7c49adc412/4th_grade_fiction_reading_passages.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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 5280 bytes
SHA-256: 3a4b66099f1ba16545a50b0022d70676dde20e539d4c94b2216c82ff8396729c
font_01_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 10748 bytes
SHA-256: 4bc8bcefc03dadb7a1d18dfcd15ba0ad98a61bc2a99eaba10ca66d19ca7995cd

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