Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aa6939648f6607…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 02:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b867a029d798d30e742ad078b7387861 SHA-1: f40be74230d8fbf83ec91786461db21fe3cf082a SHA-256: b5aa6939648f660725846fd14e239c74c5a8cd79ded0df2f3f842fef6e326e4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample's structure as a link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://klawiatury-foliowe.pl/_data/file/63821118557.pdf In PDF document text
    • http://barrospizzadb.com/uploads/files/57922795684.pdfIn PDF document text
    • http://skomi.ru/img/files/file/wumuxegilubuzis.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/89188209475.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/fujobigujigi.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/55869927182.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ffaf3b712e9f2fdd59906514d0405c0d/64643702202.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vugadafawunon.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138c49dd5f51---41004620414.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/pevebivasekoresakid.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/lojaveneladunon.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sovipumawiluwaneguwu.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/10535468175.pdfIn PDF document text
    • http://allasclub.com/campannas/file/46605755982.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/67607623317.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/85295765127.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/68313497472.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/8464922175.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mabomoxuxawo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9d0b61ac---dapovanidogebimiza.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/wuwotetedapifo.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/63133679276.pdfIn PDF document text
    • http://irollee.com/userfiles/file/viwebozujabifanibipigivid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=uplikes+net+followers+instagramPDF 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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 17564 bytes
SHA-256: 4fb96247f443db43f578e712f663c935aeb73c991214180c2f6d2688ebd9397c
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 10888 bytes
SHA-256: c7516a2b1eee2b8e7237e454e65f5fd16737c6f76023ec90791d94ba9507a09f

Open this report in the interactive analyzer, or submit your own file for analysis.