Malicious PDF — malware analysis report

Static analysis result for SHA-256 00861352b3f03516…

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 18:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd04db3d15f6c97640db02fdef212002 SHA-1: 758c569e59781fac5c42bd2b9a1f58ff4bcd6d2e SHA-256: 00861352b3f035162ea2bfdfa140dddf768f6e182cc416b6cca08789628fdb98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to distribute links across multiple low-reputation hosts. No scripts were extracted, but the presence of numerous external URIs strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=wwe+2k+hack+apk+download PDF link annotation
    • http://neoneofitou.com/ckfinder/userfiles/files/635254774.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/81931755148.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/20084596231.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/gudolatosenesirufuma.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/86942386268.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/xetigepukatopeseza.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aedbf4d6ae---motaxavafeguxasokexev.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631082432.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/migugibodute.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/wumidopoxi.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/89266830734.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/39181197287.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/dozevarugusuxuxexofuwufi.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/62616480856.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/3815983066.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/kijigivetexufesozim.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/89889994039.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/60459165132.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/57132494901.pdfIn PDF document text
    • https://fratellifurloni.it/file/semekugetomirap.pdfIn PDF document text
    • http://banquat.com/userfiles/files/kifatukuwopipabukelewo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131382fc8aa2---buvatorusudawefevowiruxu.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/wasujikasozigixeluwe.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210907141048394.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/ratirojoxojupo.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/gesapafebefixu.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_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 10444 bytes
SHA-256: 282ec1ee200a269a124949cfa215c718dc8a52f46c56deb4f5485c3a1e4b7576
font_01_sfnt_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 16328 bytes
SHA-256: 174d4ec57f768a417ddf0b4a4e4432690e4123c5344463805051633af2e2712b
font_02_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1