Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd7b5a327e4c026…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 20:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c86e0c75ae018540916d7692b89e768d SHA-1: cced3baff48211880a23a250fc4f7e02df686c7a SHA-256: 4dd7b5a327e4c026b57bb35312977ec960b6a7bd8d9eb43d35deeb7beb9dcd02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting it's designed to lure users to external sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further indicates a pattern of hosting many links on disposable domains, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lechioutdoor.com/userfiles/file/29619643418.pdf In PDF document text
    • http://parfumerieindex.nl/images/uploads/28132417703.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/xemizujuxenutox.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/12274222232.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/90963477402.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/patuwuridagasavut.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/ninoju.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/16421679130.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/sabikiwoga.pdfIn PDF document text
    • http://baoveantam.org/upload/files/fimemagejofadafepi.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/wuwalusanefisusorovasog.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/jegogej.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///polafuxokovopikitu.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/12952385221.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906091616.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/komojekunozug.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/napumininif.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/rigowuzubogoladesuje.pdfIn PDF document text
    • http://mlead.net/images/e/file/71730247572.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138253158fa7---31641049711.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/86qeb4gmbpjeog866r72hu0e75/nejejegopusajipeti.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/82502215036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+hard+reset+the+android+phonePDF 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_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 18196 bytes
SHA-256: ab312a91479fb0982b9e49d5e406d5113d40e86dd127095934ce7fe73cd8eb03
font_01_sfnt_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 10520 bytes
SHA-256: bf4300c848b5f1d5dd0631396baa566b065b3eeab2c84c8ae882d8015490c432
font_02_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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