Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa69eb922b849f7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 16:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 073f26f18439b424633430dbfeba9552 SHA-1: 3f16cd24422f8d94523d46c9cdda51145ada0ce9 SHA-256: 0aa69eb922b849f7a1d65503aeeec0545ab3fa797b06a2550f3ca00fbb1d796a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external URIs and the overall detection pattern strongly suggest malicious intent, likely related to phishing or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=phonics+blending+words+list PDF link annotation
    • http://songhandiban.com/uploadfile/file/2021091001575473499.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/30838486391.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d71a44f1---pipileberub.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630904307xilepelubarejafijal.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_B0B2E858DC64AA67.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/22460654601.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/rolevawasavebaneba.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///mebivufizuxuzonu.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/fobet.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909021349.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/3565303918.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muberoxezuwibiriribamef.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/jakegeve.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/63351611097.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/kifinasiduni.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lurak.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///96794069704.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/xasijovone.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/44620476857.pdfIn PDF document text
    • https://codecs.ro/images/file/wadiradexovokar.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/pinitimedizemux.pdfIn PDF document text
    • http://greenglobepms.com/uploads/84724742217.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac4bc69572---72907609255.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/jiluvaxoxomi.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/refuxomugokabogup.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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10712 bytes
SHA-256: 1cadc69ebce9e62fb8dec75416f7c6db02fd0874acdaaeb1f84c8c5de543f7de
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 18872 bytes
SHA-256: 8b0b3c68cc1f7e78a6435b098d57b2ce047d945cd37bdcca2befa0637fe404e1