Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99bea512e52c53a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 21:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1fe168e492c01eb433abc1f9992a6c9 SHA-1: 0a4addfdf4dc8496cd0ca3e1d9c4c03d57196c16 SHA-256: a99bea512e52c53ab89ae23a2ff1f372a7e249034e8590d0f86305b2fc483be5
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 identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://smidgel.ru/uplcv?utm_term=time+lock+app+download+apk
    • http://quantri.thaisonpalacehotel.com/upload/files/20575179112.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/67215181155.pdf
    • http://omegapizza.net/uploads/files/85062617546.pdf
    • http://dastone.ru/userfiles/file/35434354280.pdf
    • https://aspit.ro/imagini_ws/21154676287.pdf
    • http://vit-physio.de/file/zixekomodoliz.pdf
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210914173750.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/josncs7gs5cad4ciqg5rubcvqi/mugeveroxi.pdf
    • http://nationshield.ae/userfiles/files/59421131374.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pnfiehq1a3pof0m02a9k9u7t8n/xewivisitav.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210917_D01126E2F50B21E6.pdf
    • http://glavis.biz/userfiles/file/nigiw.pdf
    • http://www.serenissimaservizi.com/files/posojogaviparadopasawi.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/dirapagilipofupas.pdf
    • https://dragonexpressml.com/userfiles/files/77669823126.pdf
    • http://shanghaiqingchen.com/upload/files/bavimofafupipowakupa.pdf
    • http://parcroyale.hk/userfiles/47074399206.pdf
    • https://paroles-vives.com/ckfinder/userfiles/files/jobatepagizibalefira.pdf
    • http://bmfjhjk.friend-match.com/upload/files/lanajimowukowatidas.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/vugusejesoratavororajul.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/47536218906.pdf
    • http://fygl.net/uploads/file/162104473498.pdf
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/97588913096.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd56.bin
282444a886f7cca8cd915bf56610d99c4aaae91c149db5dff62aa5e7988a0f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 18240 bytes
font_01_sfnt_off0000fca7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
font_02_sfnt_off000114be.bin
584f4fd105e77a4c2090a2d45ad0a1bc43b480a73041e9c120031dac135dddf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 10448 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.