Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff978dbee8bb829…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 21:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cfee46e5aec4132dd922ff856db062b SHA-1: 552106859936f1c0a458f61f1a69ec33a9260518 SHA-256: 7ff978dbee8bb82956a62e8c76ad4d5254cb818fd27444581f5b73c1a3838726
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF is designed to redirect users to potentially malicious or phishing sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=how+to+merge+audio+and+video+in+vlc+android PDF link annotation
    • https://infotechb2blite.com/bot/ckfinder/uf/files/64518493981.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/20414163722.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/38995708247.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210912222519_1807700642.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gabetetepakijuni.pdfIn PDF document text
    • https://jck.ro/userfiles/file/67397448114.pdfIn PDF document text
    • https://insp.biz/img/file/vodoli.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02b4d5069---46387743811.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/lajifumar.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/64634150813.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/48082009725.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/14837867499.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/72480193812.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/gagiwamamiruzosukodo.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/fewadem.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/99286456243.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/zosekuz.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/nikivazufalajunofoke.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/85910923879.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/novewawojanoporo.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/40733060604.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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 19160 bytes
SHA-256: 5766745850affed53f73b7ca8291c3523fcbb9ed47c460dd413d40cd93f93819
font_01_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA9 10788 bytes
SHA-256: 135454778abf70b0febc461b21231b134fad5fe2e8bf12e3bf63cbc8aa752be0

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