Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4e8ac665fe18ff…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 22:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c357df853dbaed8e0dc97e9df9ced6a SHA-1: 7cc39b9e32486a29e3fee2687ce91fd67e907b4c SHA-256: 7e4e8ac665fe18ff85a74a70c3ab902c8f4a168cd6449b89e28c9df0e52f50fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=nviso+apkscan+alternative PDF link annotation
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/dakagalob.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/90932776944.pdfIn PDF document text
    • http://juha.be/_files/file/98340804617.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/riwofetevowanag.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kigixiwunedovusenato.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402fec18acd---73743171793.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/fopobonoxutolorola.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/481793958.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/tawanelo.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/68153473679.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vawefokakafilun.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77226646742.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/43234851749.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/60254718152.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/9781548600.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/21849487386.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/46980854840.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/45447200852.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/mabefukibeliranesavorosi.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/10170864472.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/17697272193.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210914093740.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/95006031756.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/511ct05fbcttjjce5siigo923j/luzovuvalosasejapalovo.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/wiginevajijewan.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_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10504 bytes
SHA-256: 253c80a4c207aae2f36c90f3ae7f898726547e376e40df85d122c68928f64300
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 18932 bytes
SHA-256: 2d5768ce4daae7d6b978fa67e43ae758e6f81aeb73a7b639e70eb664c5059597