Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb59daad0a27ebe1…

MALICIOUS

PDF

77.9 KB Created: 2021-10-10 05:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53b9633d9c02f8e4d818cc1bf022e02c SHA-1: 8dc0c9a9d37c91ef88e023efb9748368d788022e SHA-256: fb59daad0a27ebe1223aafced878369da40aece7c46058354c571fd5cec67735
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards an attack pattern involving redirection to potentially harmful websites.

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 http://cib.lin1.ca/phpsites/vertical_living/uploads/file/81302015782.pdf In PDF document text
    • https://coverline.ro/userfiles/file/pilutesi.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/kezusozosabovejuxepof.pdfIn PDF document text
    • http://termocity.by/pics/files/91673231760.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/93390565639.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/31946782932.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/gogomolixutumajizufaxej.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/39493641760.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346eb8a271b---93924872506.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/72632678186.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/togusimemefavodinezu.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/kosawatavasaxusaj.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/xorokalatejosujeluxejoso.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/savuwabezaluvadisojolot.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/lositodugan.pdfIn PDF document text
    • http://rensind.com/upfolder/e/files/20210926071118.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/773a4b2190a820dad3512481e86d29e1/mudoninikujisidosaruro.pdfIn PDF document text
    • https://blokhol.com/upload/files/20449211912.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/78357271087.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/vumonulu.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/dizewapiwonevixobi.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/rekedoliga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=to+jibe+withPDF 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_off0000cd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 18192 bytes
SHA-256: d2d067dde990b35d156c22a3fb5c5ed363220f6318e350d402c03610d63997bd
font_02_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 9944 bytes
SHA-256: 9f9c658186d8444c0d97ef083f3c1eabb0655abd242e08e3b624cc70c5bcb259