Malicious PDF — malware analysis report

Static analysis result for SHA-256 575793f8830115bd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 03:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 662b915cea5d83d4684b7e7d9fdba5c5 SHA-1: faf6b9c6ae7a52944f1a5933b43542ee3c8ff79c SHA-256: 575793f8830115bded8b2293e4db3240abb1456b8a08f249192813b7babc75db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm, 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 heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://granitnet.hu/editor_up/48593807168.pdf In PDF document text
    • http://neoclassicalmansions.com/uplds/file/78251838304.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/genapizilodefalojezikiw.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/tiroxepozuku.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/92289173452.pdfIn PDF document text
    • https://telorgabus.com/contents/files/14880723253.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/61359304156.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/bakegavakin.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/23578352110.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/18069711101.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/zulodojepupo.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/91464333188.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/litoruvinowejafubetito.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/64162245910.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/defimusedutovavotovomizi.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/16727776.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/35899184511.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/duvumimeguworuzawufun.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/32773240474.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144da0ab69ad---78536668220.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/90204483989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+phone+cheats+helicopterPDF 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 17628 bytes
SHA-256: 7132bbd3f29576b60d936ec5abf9c58416f8090e42c2a2b76468e2aa4bd82d91
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10644 bytes
SHA-256: 627fcaaf176fddab780168776c368fc0a62a530656d792216953505e108c942c
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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