Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfe61820a40f95e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 00:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4439c4ee2f325d296882bf207731a0bf SHA-1: 24dac4b0150a6519629bf3da967fe09ef7a4f9b3 SHA-256: fbfe61820a40f95e82f389a705abca91c20ec968e309d745aff5b0ae6b0f6271
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the presence of many links to distinct, potentially disposable hosts. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://laborke.ru/uplcv?utm_term=pasar+fotos+de+android+a+macbook PDF link annotation
    • http://pdww.ru/ckfinder/userfiles/files/94542737875.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/92780179878.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210913_47029DE3BDD0CE57.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/33063291846.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/57336495899.pdfIn PDF document text
    • http://jngf.cn/files/file/vukopigijejedefuxipigizuv.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/78111005663.pdfIn PDF document text
    • https://beaszemin.com/files/52119834829.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/gogefutadugu.pdfIn PDF document text
    • http://live-net.it/file/gajux.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319a251f327---61711485380.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/7434555483.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/rebizukofosafimewo.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/bubukiwatuso.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/femisosawogokiwasojutu.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/vorapedevo.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/20289608112.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/maxagebanizo.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/saxegilabakabegiravi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/52827750503.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/64361451672.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/071cde49d18cf2a284a224e31820bd80/44021873033.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gudulepupenijisojafaf.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://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_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 18028 bytes
SHA-256: e75141a1c30d169d2946f515f0096e7fa4cca9788d8168226535464caf844663
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10824 bytes
SHA-256: 118ccaaf7b1d38b8a348bc79ea4f859380c99e62dc4b924ff75458ac633b1e36
font_02_sfnt_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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