Malicious PDF — malware analysis report

Static analysis result for SHA-256 938df725b9bdbef5…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 15:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4a0af885c0403b1ed180626a63b0c05 SHA-1: 4a341937a8df6774548ee46abb0d98462bbcc1bf SHA-256: 938df725b9bdbef5bc056244e9ca51bbb43973c559afa97e5fc7aaec3437db56
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, despite some being marked as benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e1ad45325---61827598042.pdf In PDF document text
    • https://nhahangthanghuong.com/uploads/files/xafaditoxi.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/99308530751.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/78010261847.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/79311183513.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/79711666470.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/77129007526.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jadibulij.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xowozew.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/6962716099.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/33483712887.pdfIn PDF document text
    • http://servmed.net/userfiles/file/35696624202.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/fewisipapopapowekukofaxas.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109080244235362.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/lapobotuwudodisepozu.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/7425454165.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/7438065689.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/lojif.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/49298946483.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210901225436.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/jidaxumefa.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/52875893897.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pupamuzotuxosabipaguseme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=amongst+friends+streamingPDF 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 17468 bytes
SHA-256: 492c0c351e016e209a0b6e2987d3387b88141edbb52b99bfa72d5394052247a9
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10632 bytes
SHA-256: 0dc0c1e6b42c15d38c7dfafbef95b62c7e67a59af08d854204d6d7989ba8c8cc