Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ececbf077b6baf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 03:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0669494d67c0f7d4312ba921043469ee SHA-1: 69afa98bd6d815b7c1087cd3affe75619336debf SHA-256: 87ececbf077b6bafd343b8803232d39e1c40b3a7dbef3c3159c0a58dcb3ebe42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=starting+a+sentence+with+on PDF link annotation
    • http://gatewayhotelbangkok.com/upfile_hotel/files/8283469461.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/23520384034.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/nununufefive.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161430cd2dbd3c---88441790526.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/bosonogevajat.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/154285828.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/kajopekolepuwegagodi.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/wolak.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/18978722.pdfIn PDF document text
    • http://unityproductions.com/upload/files/26542700513.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/25132436762.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/72018228.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109150557505893.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/mobomukagaxeraj.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rekanaxuvanewibif.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/tefirepezevegunopawonuk.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/50905466966.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kamosirutimibo.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/xamaxusifaxususodexitiwit.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/bavatuxokazezi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/4431097104.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/duwoguwitafav.pdfIn PDF document text
    • https://carlojans.com/cms/file/futibivozejedazezijosidi.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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 17292 bytes
SHA-256: fbee6730840b71bd40d7d8161263959c7f6bb64d7145861bf800e70419111ec4
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10624 bytes
SHA-256: 4378afd7a53899bae39431ee4bd1251ae02a59fc31d264bdbe6ab941a8e0f880

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