Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46c7eaaf7abde8f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 17:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 208a89bb279ec0b2a636390dca9df775 SHA-1: 0288e45adc6f432b7eb1543b9c5d516b9d1744a2 SHA-256: c46c7eaaf7abde8fe559ba0f8f069e61589b7cba602685b1453b40804927d2ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=what+to+wear+fashion+over+40+gemma PDF link annotation
    • http://kozelsk-adm.ru/files/uploads/files/54739020454.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rutijatu.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/59299352979.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/92129046758.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/22969090467.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613645ec498f7---17649530242.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16312426935YgA.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/36998225880.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/51226355061.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/diresegujebezumeziwum.pdfIn PDF document text
    • https://777mto.info/contents/files/tujixozutepakoginezu.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/zurekezazadamedusijosusam.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/70243134193.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/nakebuxawaxajir.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/73673457894.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nifav.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/51186988401.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/vepeduxe.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/wejukizenukeja.pdfIn PDF document text
    • http://orderkai.com/uploads/files/gewabamibepubugum.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/83153387631.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/aea52f3421dd04ef0cdd54fdcd5af779/jokotupopekodadirivezano.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 17932 bytes
SHA-256: c5b15a041cdd6bfc5d4aee68443578215c66c106b0d36bad78400ddd61b298d7
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10960 bytes
SHA-256: 57ab6030a9a00bc597ea2b26611f84407ec55602de388ba5c99c56c5401c5828
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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