Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57cfa190f8e02ad…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 02:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 464a39d0f28ec5dd90b007da0068ce1b SHA-1: 567a4c0f8a77798f8a5589adc513e584196f2e76 SHA-256: b57cfa190f8e02ad154050238b84c3ddd0f9c1c220b7f98c91c516cb8334124c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://xtra360.net/campannas/file/zudejotibog.pdf In PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/vikamezibikilo.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/totivixo.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/gisuj.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/45653701259.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/64202350795.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/44957851235.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/bogax.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/dobemilovevirogi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f1b772ee8---xamiruvujudo.pdfIn PDF document text
    • http://clingac.com/d/files/13116399128.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/valipatuveduragijawolosad.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/80932276303.pdfIn PDF document text
    • http://esipro.be/userfiles/file/jilasif.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/54140918757.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/47427995569.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zadexufoliguxugewuxobo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/653db15b4c23864ad50a3f3c1268b444/45411988118.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/15013661037.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/46306459041.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/jetenuvosa.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/jiveguzeposefigukuvove.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/57062073862.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/48708011774.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pibolutesekewiloj.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/fipiwirevopodegolosuti.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/19520877682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=flaap+io+gamePDF 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_off0000b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 14344 bytes
SHA-256: 524806f7236f0b63ade912eab749277944b9d582dfe2d45792aa9c5631fa592f
font_02_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10100 bytes
SHA-256: 67d44c1aa83fcf5cc9b0e023b474a8548fa228e9ba194360cedb85a111d0e2ba