Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d41e71d54fe331…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 07:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e1a05f825da7728514da79091c0abeb SHA-1: 45c26714cdf967885c6257379b0cfad730c53828 SHA-256: 75d41e71d54fe331ca6ffc1b0cdbfa86b9d9d609d9d93aaa5fa4d406b0ca30ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://szallas-karpatalja.com/upload/ruvekalanamakepu.pdf In PDF document text
    • http://kolaykanal.com/userfiles/files/kazazumok.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/47000873126.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/42317954924.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gajopujosuturotuwe.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/siledolikotagawunuf.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/tiwofinapaputilus.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_023249.pdfIn PDF document text
    • https://energooptima.hu/upload/File/14624638641.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/wigolukokogexugisirejilil.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6e66328b---fesojumalaged.pdfIn PDF document text
    • http://sinostandards.net/upload/files/konozub.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/lekukegejeniwakabu.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/butok.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/38940465444.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/watotu.pdfIn PDF document text
    • http://spiregene.com/image/files/20210908_222507.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/lezujag.pdfIn PDF document text
    • https://baglab.pl/galeria/file/bafonirunozumoxodejifug.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/dokuzukiradevevamojora.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/89418222045.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/26864730127.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136052a1cd90---xifawujijigeto.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/83037726967.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/futanivusituk.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/45270163679.pdfIn PDF document text
    • https://ijp2.com/contents/files/18619589066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=standard+ringtones+for+smartphonesPDF 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 17068 bytes
SHA-256: e404de94708edd45b719120ffefe85e022dc9a6222aa7f630ad775c1cd55ea6b
font_01_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 10972 bytes
SHA-256: 7f1088f9a7b49d7aa9deb62396fb2056a0f2a5ede7ed791a077e9e3affdb735f