Malicious PDF — malware analysis report

Static analysis result for SHA-256 806655d46b9617e8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 20:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af9c1156490cdae330ff7b120d2f7a58 SHA-1: ce03324d51a4490ef612a57f61a87e8b117e968c SHA-256: 806655d46b9617e80e26a28ecab49703a42366f08f3c74f1c4ba3d140e3e002d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially disposable domains, likely as a lure for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hophungvietnam.com/app/webroot/uploads/files/10826212757.pdf In PDF document text
    • http://munnartourism.com/uploads/file/jadoxikotewajaroleliki.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/buturisexekilumijavites.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61201765378.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/45039484482.pdfIn PDF document text
    • http://safarang.com/basefile/files/lekemazisezekelowemowu.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/zarakekusesiguxujisumom.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905013729.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/41040711247.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/safutozopatijoba.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kurixobinusabakutopuniz.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/wolopudulavopinosi.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/95876545802.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/lavefofimepev.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/xijozesadasifizavobux.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/duzusobuk.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/larobagesedez.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613190377b96e---89238766027.pdfIn PDF document text
    • http://beta-rc.com/upload/files/nuxebujogeje.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/11131882532.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nufununolixenez.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/6690179974.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/betuf.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/5362835767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=technical+masterminds+gta+5+apk+download+2020PDF link annotation
    • https://www.instagram.com/technicalmasterminds/In 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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 17312 bytes
SHA-256: 8f52297b66ab182f5d84848a50c811f3411d1aad56814dae383b6bdf2e36ac5b
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 11476 bytes
SHA-256: bd04e5d34acde369ed28ca28ed8029289a4a08f63471ba0448c17576f3b46751