Malicious PDF — malware analysis report

Static analysis result for SHA-256 95766cd4cdd4e4a5…

MALICIOUS

PDF

87.1 KB Created: 2021-09-19 01:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f19f9af0981bd0e8490c3e11a4985b82 SHA-1: 8778b534f3813aa3b70cbf6d4b178491093da877 SHA-256: 95766cd4cdd4e4a5d0022c01d3a8206b1c37f63be7b630082023a10881bc4c25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs and a link farm heuristic suggest the primary goal is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=first+android+phone+release+date PDF link annotation
    • http://hytechcommunications.com/userfiles/file/somotugoguwuzax.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/5684992353.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/57102441478.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/suzugixosi.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/bufakapage.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/79959564668.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad3dde14---89416970879.pdfIn PDF document text
    • http://belean.pl/userfiles/file/tifazixosonejij.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/zipinebo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/29029651952.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/nefafemebimovove.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/biwojo.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/90744869219.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kutamunuregerabova.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/tokijosezibiwijav.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/21485505964.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/faxirutezotirizozewib.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193105318329.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/vinokunepiju.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/74686716721.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210906_CE8611BDE3716D6C.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/41567589362.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dajs7d87qsft03v7j5o34rp44s/27680219867.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/79916747883.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/15579076859.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 10464 bytes
SHA-256: 0b05917168c537507de6875042e993208e78ce9b561b945741eb421240354bfb
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 17940 bytes
SHA-256: 1b8324549707e7714ed1d84997e047f0af24cef1f220f50a95ae8e526de6693f