Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19abda631fb36cd…

MALICIOUS

PDF

77.2 KB Created: 2021-09-26 11:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b2868ffc39f3d4947736e84c77011e2a SHA-1: 7549969fb2849c2f2ff425d51bd74de2f719a9c4 SHA-256: d19abda631fb36cdaa4b21c832978f9df945faf27314876c654a5425bef28f36
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 high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. While no scripts were explicitly extracted, the presence of PDF_URI and embedded URLs suggests an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=different+browsers+for+android PDF link annotation
    • https://glamweddingdesign.com/userfiles/file/44514792227.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/91130424485.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xidej.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/sixivukudewenuzomiji.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wonunovuvasipumefa.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/somituj.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/66110658539.pdfIn PDF document text
    • http://355353.ru/userfiles/file/xijejikoxukufinadis.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021092113325170554.pdfIn PDF document text
    • http://osayit.com/images/file/49467023065.pdfIn PDF document text
    • http://thegioioto.store/upload/files/minajonomuluv.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/mifomopuj.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/nofatos.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109250408563855.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/79643005859.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109241549376573.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/lavakireretiwexafitaxapa.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/m03pcuhfr1cf5e8vjfee807372/23830093860.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210910_0EB01A2A41C90B95.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/pakakexivenokafitu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/defezagirusejedijufuk.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zogukemizurepiregenajak.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_off0000c19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19A 20548 bytes
SHA-256: 2525624ecd80a29a19cdb589895ab3a4a2208ea921482a96b289e677f73eff3c
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10528 bytes
SHA-256: de61f787214ba2859e249159ece3e0fcea3a29ad78ba0551c7dff139ec6248e8

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