Malicious PDF — malware analysis report

Static analysis result for SHA-256 583c54acccf002a4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 16:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: faf695f3999e41d03a2e7b7e4887fee7 SHA-1: c0f98c70bd2834f6df3265b9102d15e6ea4b9d0b SHA-256: 583c54acccf002a4ebacd9242afb6966106d3bf044a7106db7a0ad7b41e6be8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The `utm_term` parameter in one URL suggests a lure related to 'full hd player apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=full+hd+player+apk PDF link annotation
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/dujizurenitalowadusun.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tamapumevaseruxuxijipeg.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/88553141110.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/wijisaliv.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/82384405880.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/70206602123.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161343622d3bad---95158404200.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/18371209314.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/liwiraxul.pdfIn PDF document text
    • https://resicolor.com/upload/files/71488263913.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/lapizeremoponexa.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/sagutotuwoxutefimulereg.pdfIn PDF document text
    • http://henca.com/files/details/file/89882437206.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/gizomibixurep.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/veboramejixedo.pdfIn PDF document text
    • http://pololanna.com/user_img/files/98983456883.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/53713330053.pdfIn PDF document text
    • https://theipbuzz.com/images/file/45303823779.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/93903267792.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/watajusuniguwala.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210903_011855.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed07cad34---24690673930.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/10961104345.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_off0000c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10188 bytes
SHA-256: 09c4230d580f5e2ab0b4ae47bab85bb260ec6a4fd84ecd1c4d750bb0040c1645
font_02_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 18516 bytes
SHA-256: d376c2adef93eb3f853ceffb51b3503e456f7dae4643e601acc9a0bfe4410eb7

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