Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b987cff27c078e…

MALICIOUS

PDF

71.8 KB Created: 2021-10-04 09:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d6d46215165c143a594a55059907d2bf SHA-1: 2eabed88726302f4b190c5ed8cb8d744ec03b740 SHA-256: 27b987cff27c078eab448881ea25050691f438a559c6ab7c63a151b04c4ce6cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://onlinecommerce.bg/uploads/pages/files/99336304133.pdf In PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20211003_234337.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/zelusevi.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/kopuvuzafotisufut.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/duzuvamesirujetujobonopul.pdfIn PDF document text
    • http://roocenter.ru/upload/file/53864340299.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf57b9876dc5c903049912d86af206ad/70304368576.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/17886378238.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/lipigomanivivojiboremo.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/32050315424.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/86665269871.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/48121883895.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/5566183214.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mjnv4sraq4dbr28avnpeakifst/97966631330.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/vupatipepojalivifuze.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/nidevupiripifixupubalov.pdfIn PDF document text
    • http://rurisnet.org/images/file/25183143950.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/69588902901.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/lenadugupojisuxor.pdfIn PDF document text
    • http://liluby.com/upload/file/seguwofo.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/zutexalepijegebaxijum.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/jazininorogoveb.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/75565481035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=stomach+cramps+and+belchingPDF 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_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 11176 bytes
SHA-256: d0a4e6b2273b44f1a398cece38f66c8a9680ab435bc85f6d17f677f47ad32c27
font_02_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 17776 bytes
SHA-256: 77341a51eddf17ea8d154bfa392dc41d1fe9ea61d9fd7d9fe6d13a162d902097

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