Malicious PDF — malware analysis report

Static analysis result for SHA-256 d872ebe38cd5dbdd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 10:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8cca0bc33d908e1ce70d441d522ec83d SHA-1: 8b07432f0d106b40885cf5dc4c95dec2e97f2b03 SHA-256: d872ebe38cd5dbdd793892d48578c15e480ca631e34562f0b38b705013af4dc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://angkalaris.com/contents/files/68445335510.pdf In PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/681fa66ff47df417ae3da2d7637df539/25987591706.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/96054454569.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/mabulujibo.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/gulopowujenuluregepaf.pdfIn PDF document text
    • https://phm.vn/upload/files/riniwegisasakoto.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/tabofesorubozizobubuzexow.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/39493981332.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/64358012583.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/sigumo.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/64340723088.pdfIn PDF document text
    • http://herve-coiffure.ci/files/xikudofurexowinumo.pdfIn PDF document text
    • http://biographiewerkstatt-singer.de/userfiles/file/46582725903.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/93107573813.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/kunixaruketud.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/45645579345.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/97072339002.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/lajojalurutovamixe.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/kewigom.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/38071866668.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5366e5eb8264dd7843acae15a7682183/94965937684.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/dilijofatinitiwil.pdfIn PDF document text
    • http://cloverdiamond.com/file/53488762975.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/96054011573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=more+followers+apk+downloadPDF 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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 18620 bytes
SHA-256: 02cc143808401cbd3399fb6856fff89e5595262b0a4c78aa439918f5619cb5b0
font_02_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 10472 bytes
SHA-256: 92aa581699eaf77b3800c0c689138309c0897129a6b755020a97cfcf90752dfb