Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e66dd26cd82fe1…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 00:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 10c3d5f81ec0bdc9a31603bd9cc577a6 SHA-1: f6c5befcfc6495fce1a518833225c3227005475f SHA-256: 61e66dd26cd82fe1c9a61ef50d068a9cc0ed6b493757de340e377a6479512b5b
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various websites, many hosted on disposable domains. The document body, though heavily obfuscated, contains text related to 'Neet 2019 answer key aakash institute', suggesting a lure to attract users. The presence of a large number of external links, coupled with the ML classifier and ClamAV detection, strongly indicates a malicious intent, likely for SEO manipulation or to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=neet+2019+answer+key+aakash+institute PDF link annotation
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/bixediluz.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/bixibu.pdfIn PDF document text
    • https://zazafiwizodizi.weebly.com/uploads/1/3/4/0/134041258/401039.pdfIn PDF document text
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/f347827.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/kogezez.pdfIn PDF document text
    • https://latobebesat.weebly.com/uploads/1/3/5/9/135993630/6013776.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/bifasafuxe-rilevifej.pdfIn PDF document text
    • http://niwifara.22web.org/synaptics_touchpad_driver_free_windows_8._1.pdfIn PDF document text
    • https://kojelujozifani.weebly.com/uploads/1/3/1/8/131856125/fikarer.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/wituvix.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/nogogemirolusubameb.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/fadaku.pdfIn PDF document text
    • https://gamidamivagug.weebly.com/uploads/1/3/5/3/135324690/bodutivug.pdfIn PDF document text
    • https://wuwenesugujiku.weebly.com/uploads/1/3/0/7/130739695/tojofemel.pdfIn PDF document text
    • https://govalusazun.weebly.com/uploads/1/3/5/3/135325024/kugogapolefibog_kipawikafubi_sejinulot_kukobanulet.pdfIn PDF document text
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/4687493.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wijopimitiraze.epizy.com/lexile_vs_ar_reading_levels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b8c39f-c555-4d7e-8e22-46eeb39c78f9/which_economy_is_the_fastest_growing_in_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d6d92e-18d0-43a0-84db-1f7c33273bee/51105624613.pdfIn PDF document text
    • http://velevemi.epizy.com/32579821147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac0d6d2-f7eb-41c5-ade8-d74470012fd4/gakefidumibowav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 5220 bytes
SHA-256: 3dadfbfb96364af23820a5f1d16d29f3df69092d572ba7baa15004fd439e4c1d
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10884 bytes
SHA-256: 8386f0d6e684f036bc3db9d17619807e02e844c602a52081136b2d27421d9641
font_02_sfnt_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378