Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66d3bc35d527c19…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 09:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d019bf964b1b45b784d88eeb81f3960 SHA-1: de6e1077b6bc59411979e04d5bba3674ebe3f6a2 SHA-256: b66d3bc35d527c1962b92cd670a85f5d518cd5f59d8b5a94e3824f9ba773b7c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://queure.ru/uplcv?utm_term=how+to+hack+mad+fut+21 PDF link annotation
    • http://elandtour.com/FileData/ckfinder/files/20210918_7CB7E3ADADDFA2DA.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/41604509604.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/pokaremesitapujozorob.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/kufer.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614440642f425---36490044942.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25605632576.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/wunabagekabebebegidopapo.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/3683506766.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/27283700751.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/genetijovexutezirexugex.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/1597578589.pdfIn PDF document text
    • http://www.polni.si/Images/files/36922095298.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/39407994182.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/liroretatajegirufo.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/49549385055.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/60689642093.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/13430616357.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/gadutiz.pdfIn PDF document text
    • http://househouse.it/userfiles/files/jiketap.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/43066447829.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/digojoravapofebe.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/34607639807.pdfIn PDF document text
    • http://schokofontaenen.de/idata/96084918947.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/diruruzitebipuxulisod.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/44475245507.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/30855064093.pdfIn PDF document text
    • 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_off0000c3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D9 17412 bytes
SHA-256: 03a92475a0625e7de394f933a982a877bce0c821ec3762fd2d3ad07a9e31dbb4
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 10540 bytes
SHA-256: 694e12f234b6f8c997f56d5fe962316c6cbd7c3e2be0584e3289e239c51529b2
font_02_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1