Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff613b9860fff2a7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 10:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8f9107dd19e9bcb2bd85b14c2f7ec0d SHA-1: d484cc14886ed48311e54b72b806a58153614331 SHA-256: ff613b9860fff2a773c3d34413cc39b0f7ef3b966cb8a6918dbe1d30ef2f51ed
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/taruxakikaketek.pdf In PDF document text
    • http://highlevel.pl/userfiles/file/wunoninakagezazu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5c39bae9---28159582521.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/telifikijelesadafetaz.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dfa3ccb3903d17d8e2d40a77da5efd35/94431671160.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/vuxawaravesixonu.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/galunekiri.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/28658271709.pdfIn PDF document text
    • http://thongthien.vn/upload/files/97176466195.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/18622243831.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109031525058095.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kofolukotixud.pdfIn PDF document text
    • http://z500.si/files/79507687106.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/66592818247.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nerot.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/jexepilesosolomobus.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/pawinajivef.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/62604927484.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/17688038057.pdfIn PDF document text
    • http://bulmarconsult.com/files/poziteferawimabe.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zivepijatoxijaxefuwuwiwi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/90861285086.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/gawaratamunekeluku.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/49655355929.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/nenifovoxojiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ad+blocker+remove+chromePDF link annotation
    • 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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 10292 bytes
SHA-256: badd4487cda6895b22b77baf650a9d88ce96758adb904575744ea5f77f6fc41a
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 16832 bytes
SHA-256: 218170bd1e3e3a3d81a39e8a46af79fe66a7089458f14fa0f5ca943bdd7bbe4f
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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