Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f838e474c24cea7…

MALICIOUS

PDF

81.1 KB Created: 2021-10-08 01:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6bb4df582b82c0723a73037defd288ed SHA-1: 6552f982420f84805710ab51ffbdc4762f5cc518 SHA-256: 0f838e474c24cea78aae49500638b39120de3c50a334d5038f090d0ab1a959e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or content-scraping lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://safrano.pl/userfiles/file/giwijame.pdf In PDF document text
    • http://fullx.net/files/dovereten.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615812e522925---legekagofesenup.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/56388368923.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20211007154557.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/77951044506.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e60e76a51---dilaxuven.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/577182426.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/nadezabosisozoxudo.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/zopekuwojazepepije.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/toludavatimukomelafe.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/43611547335.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/1940066759.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/27987268423.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/xijepuwejijixekoxejid.pdfIn PDF document text
    • http://risme.vn/files/dilelixekug.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/ludidenudiwow.pdfIn PDF document text
    • http://freeorden.com/media/file/zovolemesejemis.pdfIn PDF document text
    • https://khanikango.in/file/78436795883.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64267799620.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/dogenaxumetemu.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/34271233575.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/54153954459.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/85611745311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=i+think+i+have+fleas+in+my+hairPDF 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_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 10580 bytes
SHA-256: 4d7bb9bd73458c961a5cb074b60700fdf0300b32e9b63a01a9c62de2fc00d0b8
font_02_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 17932 bytes
SHA-256: 666d08fa7c57c584bb7cbed307324672e5488ecb357342fd56e867774d58869d