Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a34e5bc573d35e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 17:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64a9af2cf874ebaae184cd1b8585d6ce SHA-1: e4a62edff0dbc1c2c4ee703faf8124faec84bbfc SHA-256: 83a34e5bc573d35e76866bf7d88de760f86517cff8a789cd733bfdc397a674a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://wowbond.com/upload/Fckeditor/file/subaguguno.pdf In PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/benanonar.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/49497344079.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210912135334_nyt9n6.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/46365663304.pdfIn PDF document text
    • http://apart1day.ru/file/8043874604.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2ipq3j9ppafrto3gh6o9pdla72/jopulojotimak.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gofikopifavovuxumawewas.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/15708052467.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/vuramadirig.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210921_044713.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/81901688161.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/83427913725.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7a87eacbebd0cb2ab2fdb8fca9358b22/9166572221.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/54199355344.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/60886862981.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/lelebuxemud.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/7322378139.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/duxesexonedem.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/gelovogaw.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/zokosugatobikoluwididinuf.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/tufavoda.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zasisevosanodenoxamafube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=index+of+penguins+of+madagascar+season+1PDF 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_off0000ae0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 11024 bytes
SHA-256: 99fad33c26d68d4917e2378e2304ff2d0a217bd0b069fd9a0402c2be11f07c24
font_02_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 15080 bytes
SHA-256: 12bbc5eb8c5ef2981fc537a3316401e192cebeff09509aaadac9df74bce82692