Malicious PDF — malware analysis report

Static analysis result for SHA-256 77835157729fe317…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 22:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 090c889849d9d03b8031245a35ff2d91 SHA-1: 3c6bf30b7746786238055df449f38d8d043b58d8 SHA-256: 77835157729fe3178f85af54c69245932bac235c9c3bfd4d58adff5cf8ee15fa
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting potentially malicious files. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were directly extracted, the structure suggests a lure to external content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=www+imo+lite+free+download PDF link annotation
    • http://autoset66.ru/admin/ckfinder/userfiles/files/76560103691.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/belotosewonodali.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/lobajolimesedasewarasuren.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/fowegadikimun.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/24139744773.pdfIn PDF document text
    • https://777mto.info/contents/files/71061356341.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/86112007775.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/durudetabiromopevererixek.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wakuban.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/36418744250.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/kajopojawuvewazaz.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekonegotitunilotofozefi.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/30203746445.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/18686725.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/25873655140.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109090929176303.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/soxobejemuvififizibet.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/28779748729.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/55482874624.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/dipuwajusofazasumak.pdfIn PDF document text
    • https://badrivishal.com/media/19500927072.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/gadepuvudimadela.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/sofosavisewef.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB531 18632 bytes
SHA-256: 13997857c245d049943b7b4c0ee905024e5c947c398bcb0386ef21d8f0390eea
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 16648 bytes
SHA-256: d4cd26d64e447e38d2160d0287688f065b4a3d4afbd0ae3d89b08ff4f5288b46
font_02_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 10424 bytes
SHA-256: 2a8e2421b022d0c3264dc77a8b9ee34c71a9fdbe3708f4d818eef7166765079e
font_03_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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