Malicious PDF — malware analysis report

Static analysis result for SHA-256 896bca948315d796…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 10:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7916f84db366581d1ccfc5a13fd6380c SHA-1: f6fa6efc2de2e2e97aba8fc1d0bd1d67f2e3c99b SHA-256: 896bca948315d79671b752f29efa5fcda4c25ab21df7e05652f8a1dae2efb9d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

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 http://immodraft.nrw/images/architekten_agentur_images_/file/79782015435.pdf In PDF document text
    • https://anup.bo/images/files/68268869655.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/30701513510.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/wekifagekudowubafumelix.pdfIn PDF document text
    • http://holzweiss.at/lixinidopododotobiwe.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/97566741499.pdfIn PDF document text
    • http://gespk.com/userfiles/file/74544422445.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/81172333223.pdfIn PDF document text
    • http://polipack.ru/content/file/tixuweseponuzafimuzi.pdfIn PDF document text
    • http://ndt-ultratech.com/files/lowuzepozamemotezadoj.pdfIn PDF document text
    • http://altus.pl/userfiles/file/28880060728.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22872986890.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/bokuburigopi.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/tukasivufagesuv.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/givepuvekusidowunawire.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/34140192950.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/xamomekekokaluganexozila.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/69474617519.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/pajopegip.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vu7mvuh3nbbt92h19cmgh82tl6/47775081600.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138326504c95---28082951949.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/89054430916.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jijot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=el+arte+de+hacerse+respetar+pdfPDF 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_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 20104 bytes
SHA-256: 42b816939197076186e4f35a1255bb973efd910f4f76075d89d7c0d3e219b19b
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 10384 bytes
SHA-256: 27f6751bb709e1d3e9192b294cc67496cb3c057a25be72a5ff622e5cff0d1d61
font_02_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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