Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e66d92336c66fb2…

MALICIOUS

PDF

90.7 KB Created: 2021-09-17 05:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17e496d3da112001ca84ed77c837b447 SHA-1: 5cd48b38d3a3450e1122c5b679035b1f954158df SHA-256: 7e66d92336c66fb2c0a9a349d565474f70630d0a149ee0d9b5ea51f4622e2744
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, indicating an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=fire+breathing+dragon+live+wallpaper PDF link annotation
    • http://dlevitin.ru/fck_editor_files/files/tomovobekepuwejomazapu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/wisinekibe.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/18821185039.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/dixafadudafozanixaza.pdfIn PDF document text
    • https://masihpt2.com/contents/files/xowakotosogelikirebega.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/42483939408.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/bufogupexisumi.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/libunovasijemojakal.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/pubiresusoluwupoloxib.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xakuzamakosuzibika.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/96448720717.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/61160492886.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/pibipenegex.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/2026351346.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/dufuzuvugivotegisilugi.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210904_B1F92F65058C7CEE.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161376ab12d611---wezofenefazuzopadupe.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/92035038077.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/41477428841.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/fipatujokexinodorogur.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/xusujerovimuzelejijuguk.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/12283955656.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_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 10772 bytes
SHA-256: 1cb18c9fcdbbc6df93dabd2b50ce97a5a9fe8029aac1990c8acaa372b2239bee
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 18236 bytes
SHA-256: a818c37f0cd4771040e4e17b3c96005a108e0855c2faeed9b390a8f936ed5f6c

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