Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96a4ce53580c8c3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 11:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0385773aa3cb4420b1bb9317cef7f563 SHA-1: 3d4489db3527a59d0fb7208655b50be96a419402 SHA-256: e96a4ce53580c8c376a5d8d411e0ddcec38138ce37410f9316d170734fc82da3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging techniques associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=instagram+password+without+human+verification PDF link annotation
    • http://brukbet.com/user_images/file/57642912853.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/86592189380.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210915135441.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ee539360ce6b3756af355beb9877de97/29887680126.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/tabukakopukuvelu.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/zarixapokujobobag.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/71463430789.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210902035850_MzY2NTUyNjMyMzA=.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/75749947342.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/vupesa.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/38343287917.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/resogapakewaxexizizepixa.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109091257029920.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/90256365964.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gusakibonizixitivijava.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/61998565128.pdfIn PDF document text
    • http://canvangdientu.com/images/file/54416114693.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/nujamabezawobokew.pdfIn PDF document text
    • http://szwygs.com/upload/gakevab.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/89669886096.pdfIn PDF document text
    • http://ingore.cn/upload/files/davipegufegamekonolabulu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/gefojavijubeseruzukomenos.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/71035444035.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/dawidixisute.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_off0000c312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 11224 bytes
SHA-256: 63133cb3b9a4efe163d307db71b6efa25db74bb91394f1110480e3ca8ef032f4
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 15804 bytes
SHA-256: 176c888de25c425caf1a9950d2f63d423af285168caacb8293cfc04d50845ca9