Malicious PDF — malware analysis report

Static analysis result for SHA-256 82be7a8e6a55948f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 20:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd6f66613869147be04425861b6a4f62 SHA-1: 4e4fc6e2c92de844669fad226c1c7f5e76f80ab8 SHA-256: 82be7a8e6a55948f1aaaaadfbd698c6e97614b30b8c48ec3d490bda06a54b1e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://oniceh.ru/uplcv?utm_term=duo+mobile+from+android+to+iphone PDF link annotation
    • http://5lovestartw.com/CKEdit/upload/files/31978971979.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/nizaxi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/13688950846.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/72241253297.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/fanujagaw.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/29863047005.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/98732902204.pdfIn PDF document text
    • https://triosms.com/userfiles/file/31817139761.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/17611094858.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/10079178591.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/21735473753.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/8739544339.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_3F4A09C80F8660FC.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/78489021009.pdfIn PDF document text
    • http://lscapital.it/images/file/zugifu.pdfIn PDF document text
    • http://k1a.ru/images/files/file/75176592621.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/sagidazexotitakad.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/legopolijitoruginalexasi.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/milosuwugajotazaroxatob.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/sudozogasataxop.pdfIn PDF document text
    • http://soles2walk.com/data/file/batile.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/64911057678.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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 10836 bytes
SHA-256: 1994cb39c912cdcf3f54232a74318fef3f1ff04eb86b06bbf5b5c49a7361363c
font_01_sfnt_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 16424 bytes
SHA-256: 8d8ea868c703a1182533154452aecc266f8644e76e2ffacebe42b3b0f3e6262b

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