Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0db5a8fdd3096ff…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 18:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f9d7c5110d4650a0072a5c42a037b03 SHA-1: a7b48c8f553bd55b8446a7736cf1964ca8329db8 SHA-256: a0db5a8fdd3096ff086c5b12fc0f05a9a4d52d351c5b1ffe7bd1f0c7c5eed3a2
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, indicating a phishing or redirection attempt. The presence of external URIs and the link farm heuristic strongly suggest the intent is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://agppi99.pretty-match.com/upload/files/zonevunaxulojoserofarux.pdf In PDF document text
    • https://danielstrehlau.com/userfiles/file/wukopimesob.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/jisafanozutaj.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/68833059145.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jerunujulubusubiwu.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/95331908375.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/vimatu.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/82251025006.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/niwipazivosolu.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/24523916464.pdfIn PDF document text
    • https://steammining.com/userfiles/file/nafagagog.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kipafizezemaje.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/83483243240.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/valadomuzab.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/94451061202.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/51001576712.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/31454563372.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/98101802968.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fikamanoxe.pdfIn PDF document text
    • http://eternaseguros.net/files/files/dulobixelutem.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/budatavaligojimofuxazali.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/15946190592.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/xilopegumodem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=goal+setting+theory+in+education+pdfPDF 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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 14860 bytes
SHA-256: 558141e868e47a5a43c120d2be0351c4975126dedf154b2ad732b205c8433a5f
font_01_sfnt_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 11152 bytes
SHA-256: eddd58be428e780c6a669552732c92676f6ec65882bac0629b41b735925a151b