Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d84ae10f3aff190…

MALICIOUS

PDF

94.2 KB Created: 2021-10-09 21:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5bc676f342477ab117938197b4d98b80 SHA-1: 4750ffa121e60563b7ccd0a3ca57b582b21d7df8 SHA-256: 9d84ae10f3aff190a77aecbc171c136ca8951b200108163d66577453fcd2b427
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a scheme to manipulate search engine results or redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://docommerce.co/calisma2/files/uploads/92958164969.pdf In PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/dalagotunedokej.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/saximigitenak.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210912_C834360C3FB1149F.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/nezosekekelevafubufusobij.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/43174728562.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/79106352842.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tobaravediwolodavon.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/vilarex.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/foxejowiwaxud.pdfIn PDF document text
    • http://willbramephotography.com/26699300445.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tajomajezuwifig.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/jonebax.pdfIn PDF document text
    • https://tierlistei.ch/downloads/88643873654.pdfIn PDF document text
    • http://ozsersogutma.com/upload/files/88539524810.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/pakenut.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/wuperugaxedukamidure.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/movasuzuduvukerulo.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bekipofa.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/xebibuwixonat.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/44990324788.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qf365vjrqhhh0bo9ogqfma9357/xunuvifubijulaja.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/17304778643.pdfIn PDF document text
    • http://one9five.com/userfiles/files/xusikawavegeta.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/nefewitaxuvikob.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/42258080882.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/xilaginiravip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=if+you+love+me+now+chicagoPDF 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_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 21876 bytes
SHA-256: 2c058bd33108f546812946ac8d54d0e0b159045643ef4208846fd56255a28a0f
font_01_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15217 10736 bytes
SHA-256: 120ed19906fe349b126660281a8a7d431fbe25b91e3431cce3cb47d06cf5e0ff