Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3dda777b5bfa64…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 11:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24c87cb2b672aff5473cbb979cf9b4eb SHA-1: 82fa6856dda29fb72e231e6470516d65247f66c2 SHA-256: 1d3dda777b5bfa6479f0c64b2bf7ebc80976f4b425bba9a6b7b66de7e7c7f571
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow designed to trick users into downloading further malicious content, likely disguised as media downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=tamil+movie+download+2020 PDF link annotation
    • https://menu2uplus.com/images/file/84304403193.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sufivakunu.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090709192169.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/38150032743.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/kuwonorezuvaxazuvefurami.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/pujupaperisa.pdfIn PDF document text
    • http://nut-shell.net/upload/files/puzomajafusurezifi.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/70337982073.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/49169658514.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/40592277198.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/lefog.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/15300601700.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/kivede.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210911205710_virecs.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/91429242173.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/47411641692.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ok41lehcl5o5iqevo9ibu1f1ia/kedixewogiwafipaweru.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fc26b986---11373532575.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/66141268800.pdfIn PDF document text
    • http://dsagco.com/Upload/file/60832725973.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/28057883037.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/bitivubeburiwof.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/tusazibikeke.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/93604112355.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_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 10400 bytes
SHA-256: cb23245a03301ec27b121a6f5d38732319f9391b310527691be665df6e273a71
font_02_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 18304 bytes
SHA-256: fd26c3a13d56cf2d9c67cb3a49a5d1e5805f11a04d9026ed0555a41594eacc85