Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d572f54e2eba73b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 03:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bf26430f6225629b5486e1f23796217 SHA-1: 222fa7efbe6d15d8a5610056f20c1698bd02a587 SHA-256: 4d572f54e2eba73bb4da4983f5df66903635310a2f36616b2e9037a437a4feee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs pointing to disposable domains, suggesting a phishing or redirection scheme. The embedded JavaScript likely facilitates the redirection or exploitation process, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=unabridged+dictionary+pdf PDF link annotation
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/18690298008.pdfIn PDF document text
    • https://123natura.com/stockages/files/duzaxavewitijabuxedi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c81b439fa---gunolagonasemibabumodoxu.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/37940308650.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/nuvoteb.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/82911328493.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/6492131067.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/tovuzug.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/vagutugabokitekukiwoben.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/zifekisuzila.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/xudevumabesavosobifigope.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/tilojexudipobevasof.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/fokatejuj.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/tefuxevajujaxigug.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/32999900079.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090408071770554.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/40586984593.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/pemus.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/fezawujujejidesi.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/88578150815.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d93c71b372615ee5622ba39c0824898c/29445814875.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/nawezi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/5501304438.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/45005870974.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/gukolujuraxelaluviwud.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/87691361787.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 10840 bytes
SHA-256: 1d8c8611315710f8d1718b4fe88697e93a3a618837763c7a1f377dab17edc2d1
font_01_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 17988 bytes
SHA-256: 4402359b514a5be504017d5975319e38305f7c0c663c7acad11666828c28578b
font_02_sfnt_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1