Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a01b66ae8db584…

MALICIOUS

PDF

93.1 KB Created: 2021-03-28 01:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19406e786ed796154d68e9bcd3c0604e SHA-1: cd4ed62784fe5d73e1c24c89523eba13e341b7c9 SHA-256: 28a01b66ae8db584c12eb58813565bc7caab1673a840e2b03f18be64a8706b3f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The primary purpose appears to be directing users to external sites, potentially for phishing or SEO manipulation. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/strik?utm_term=cuantos+kilogramos+tiene+un+metro+cubico+de+arena PDF link annotation
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/e0254a9.pdfIn PDF document text
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/5455513.pdfIn PDF document text
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/xikifisosubegusujado.pdfIn PDF document text
    • https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/5e0b6883a63d83.pdfIn PDF document text
    • https://jakipafowikodo.weebly.com/uploads/1/3/1/0/131070805/7857071.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/f8a3afca3.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/7636b24a037.pdfIn PDF document text
    • http://vinulologezew.iblogger.org/agmark_standards.pdfIn PDF document text
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/e5773d100.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/devonojenojer_kopaji.pdfIn PDF document text
    • https://gepadera.weebly.com/uploads/1/3/0/7/130740344/mabuwemikido.pdfIn PDF document text
    • https://xediziku.weebly.com/uploads/1/3/1/3/131384396/fumisezi.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/55893143739.pdfIn PDF document text
    • https://tigerabedudutid.weebly.com/uploads/1/3/5/3/135304069/ad71174f6da5b.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/28657213995.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/tojovozeraveno.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/nabolonafisu.pdfIn PDF document text
    • http://jedefanase.22web.org/obras_de_simon_bolivar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_92beb0a15830401d8782827887893314.pdf?index=trueIn PDF document text
    • http://kedisijusa.onlinewebshop.net/ladalotopegusafese.pdfIn PDF document text
    • http://wesimuju.epizy.com/dometic_ac_cover_black.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_95ccb070b17f4201af4cabb19bd1d168.pdf?index=trueIn 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_off00011d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D13 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 5368 bytes
SHA-256: 8e7463acea1eaa223a7442cbb8e4fc5271014f23b587278b2ade36f0243b12e1
font_02_sfnt_off0001397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 14112 bytes
SHA-256: 3e0c691f2fcb0d6da727d83ace81b2e6e60f94cd83abd9fb4c597c8b225042cf