Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f9da3e004d6e73…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 20:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a75a5c1fcc053a5c851f6a42fac74b1 SHA-1: ca5a094deb35e4b353fc18fc48492928daa49260 SHA-256: 80f9da3e004d6e73b2f08608fefb64273d7388b0670429e1850e294dfbc2b9ba
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests the document is designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation techniques commonly used to deliver secondary payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://koppeika.ru/userfiles/file/jusebilixata.pdf In PDF document text
    • http://studiodebiaggi.eu/userfiles/files/jesozarezagadudo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f7b58813f9908024ad591acda6b2ae5f/85695921306.pdfIn PDF document text
    • https://terracell.info/images/file/83018577540.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/40af228ad0dba3d7c0571d74ee7a9597/bisur.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/rubasakew.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/dobapijejinukavekebok.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/dojogixibunogoraj.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/68680264087.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/bawobezimadesanasul.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/zuvixomebejetut.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109082020219987.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/86058085439.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/90507208017.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/mibamadu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/62522710831.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/44905850020.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/56251542393.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/menumupinolizu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/sexijuzi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sulabavivazivepixotiluke.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/94435859369.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/nokakabuzajapodurufopapu.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/31779648554.pdfIn PDF document text
    • http://kd-council.com/upfile/files/43691722985.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/jedulugepemeruziwexasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+app+to+do+listPDF 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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 10232 bytes
SHA-256: 2bd265e4905821527d5b62afdd93249b9404671cbddd5a160554dd855caedda6
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 17632 bytes
SHA-256: 1b2ca193111c4ac54ca39c6fb73597e2560ee71c5ad14b559c6cc5cb5d352b48