Malicious PDF — malware analysis report

Static analysis result for SHA-256 26fd61670e642059…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 16:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 889ba961d3cc5b53def99917fea15917 SHA-1: 4a7b962baed146bdc57efe228eb6285bbedf77f0 SHA-256: 26fd61670e642059ca935b8238b7418377c5661d98bbf61a47cc1689c56d63da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=powerdirector+apk+cracked PDF link annotation
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/7029469760.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353dad416d0---45085838872.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/57111874220.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7cd97caa---63863553957.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/1693645911.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/samuzele.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/71343870256.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/88973840595.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/wewafabimolefalosug.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/45299451392.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/63781112372.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vapodurogetobewu.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/43259202625.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/58264423772.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/kirexik.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/67057879274.pdfIn PDF document text
    • http://videocycling.info/files/file/venijafofojoni.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dozixewivokobidevenugus.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wuvejopimu.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/57354794472.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/zadezopomapojapu.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/070450116334.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/nezotepoxuxunipajupune.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/jelitogilojifuxinef.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/15461808248.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/5795446458.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_off0000b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB940 16136 bytes
SHA-256: fc47a89aa21172f245680cb169152b9916653442a87ef863f7ee17d0a901cdf4
font_01_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 10368 bytes
SHA-256: ef90066810255310eaad860dceae4975c2a298bc5087e654a73281fd8ac54fd8
font_02_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1