Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26bbbb39bc085b3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 13:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f5683b343c9ff7817287d313048b11c SHA-1: 4b4e3611bf38a63da1962ffadbd10f4684743db1 SHA-256: f26bbbb39bc085b357b53488bf13fe183a30b8e79019a71f9f6fb9342d2b160e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated maliciousness. It contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

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://trustarshida.co/cache/fck_files/file/93152387645.pdf In PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/53652207148.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/nanogobuzaboramop.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/fupavisuxigagovepaw.pdfIn PDF document text
    • http://honda-vo.com/upload/file/pimakiguxibefi.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/kumumonazusorojetujedarur.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vupodulilofavurevogolav.pdfIn PDF document text
    • http://krupongs.com/images/file/dininafomo.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kakujegeku.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/fenat.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/93342109718.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161300664e7d6c---9379787831.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/98419348977.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/19436891454.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f441a1d28d---11673409568.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/bejufamukofosor.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/86225100212.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/xerifetarovukiwa.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/57800057011.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/geluduginedituzo.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/xosibid.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/javedelatenite.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210911180850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=alan+oken%27s+complete+astrology+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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 17672 bytes
SHA-256: 7f02c2b2b0c5eba0134742490bd418bcea977648acd4969836432263c142d60d
font_01_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 11092 bytes
SHA-256: fcc433851716fc58aea33287c9ea36324bb3b9b7a15b858889473f4366a85790

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