Malicious PDF — malware analysis report

Static analysis result for SHA-256 26319630eeca07d8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 11:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f8a105ff192a4dbd556a5fa6b67fd82 SHA-1: 847a35210a850ea97f953b912a70aa79ceb49fdd SHA-256: 26319630eeca07d84db190aa01a748c32792a0809973a8ed2b6bfa02205e3907
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, suggesting a phishing or malware distribution scheme. The presence of multiple embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

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://crysiq.ru/uplcv?utm_term=theme+for+car+launcher PDF link annotation
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k9tp2ppke054c27mvro56j5ma2/vusoxa.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fomidetirebibetabug.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/33675645195.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kugizaxilapadatixe.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/kuveruva.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1403_20210910193246.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/64576458100.pdfIn PDF document text
    • https://gangnampools.com/contents/files/vamelekibexi.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/gazim.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/marizi.pdfIn PDF document text
    • https://hgb.se/filer/file/1857403933.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/12890830679.pdfIn PDF document text
    • http://foodchemsino.com/d/files/sepenegolalibufafoxexo.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/67776622222.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/74502852756.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/xatugiwa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161322862ddcd4---vigunabur.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///dejenuvokonomowa.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/8108907675.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/borosawawuvevazon.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/sojuvibetugo.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/46630454554.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/jusikedas.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/doxomitenojo.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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10308 bytes
SHA-256: 5608cb95f00130856a2f57af5ada5a1953509b161574a3fc9a098601e2a4d0ee
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 17972 bytes
SHA-256: cfdbdc1dd6b9d69a8321b687828b9c60912192001fbbdf6b67fa8cb1e29c50fa

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