Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd883aa14779db87…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 00:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: beadb43f80fc10a4d33d0807dc3ed494 SHA-1: 5bf199a79cb24554b9141417f4753a6712d4aaf9 SHA-256: cd883aa14779db87c1faf9a4d98974fdc28a6b8bc7dbcbbdb4c905fe6d8ce832
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to direct users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+clear+cache+in+android+browser PDF link annotation
    • http://panel2conso.com/userfiles/file/webebezasifeseguk.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/worizitezigezarabuwinasi.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/japutiremifatebijabum.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/98785738040.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/rekavirakerewuse.pdfIn PDF document text
    • http://contelex.it/userfiles/files/judulegunuterujagitape.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/43094342883.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/68390639559.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259583db0---zamobixure.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ae580cc40f165dbbc49677d376a2122e/54665841008.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/36125429636.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/47768243503.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bbbdf9fae194c04bf9bafc9afe75b902/56451781252.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/nejiraromege.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/safulegegakedi.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/bidikupiwuvonevala.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/dimewoka.pdfIn PDF document text
    • http://isvpro.com/custom/files/3628246467.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/95067734912.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/40871295886.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/73631948426.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/pomawaziwixuwejabaxisili.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/83134975887.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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 10684 bytes
SHA-256: cbc69b5e196c9011a56599956033753f4da1dcf5089e8cffafc8994745fa0a05
font_02_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 18184 bytes
SHA-256: a9bb4c63219105047eeba4fd411ac5c49e83e6d5e875a788c1a0cab4345e0409

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