Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aaec065cd55a8a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 09:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad42e21c501dce674da9ea3047012876 SHA-1: e1b1288900df5186b33b440aae5f2bfaaa98aee8 SHA-256: 50aaec065cd55a8ac6833e63fbfc75f6310e9d3202f63a740cfa3027ae16450b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://nousgarage.com/userfiles/file/77817203935.pdf In PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/lolekeneven.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/nefudujeb.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/legoloxepapeberarezoko.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/vigoxitipi.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/lamip.pdfIn PDF document text
    • http://smogy.ru/files/files/bawopadeg.pdfIn PDF document text
    • https://majubesar.net/contents/files/sugolapirutaxa.pdfIn PDF document text
    • https://svltv.in/userfiles/files/fewulode.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/45045889254.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/saregaki.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/1651838343.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/4306071836.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/56741592280.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/70134718501.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/vonitewup.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/73968779044.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/72879884967.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613492b6582d8---51269118591.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b4c95683---15685687121.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7371f77ekorng9spgg0toel9fl/zegoniwafup.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/69709508355.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109090601272240.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/zinadotarugifokivewamuw.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/juvujusixonogumod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=walking+dead+download+for+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 16624 bytes
SHA-256: 67270f4f2b5cdbaa822f576528b369456ce95267326af4686daad47428c1375d
font_01_sfnt_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 10432 bytes
SHA-256: 7d1650ed21a25f318af33ac59b6ff8b6f159c4a2b861bb87fb1e626144b82ef0