Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6705523d5b75bd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 23:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f598b7ea96868a61238c09b774a79958 SHA-1: e71d2283abcbdc9255e053a0903f087d13decf89 SHA-256: ee6705523d5b75bdbdbba2408f7c9133e0f47ebdd0222ede787d627a1e90248d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating a phishing or malware distribution attempt. The embedded JavaScript stream and ML classifier further support its malicious nature. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=ottenere+accesso+root+android PDF link annotation
    • https://szabobuszberles.hu/files/files/35514730963.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/dajofipanibanulofetufuxe.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/sofubi.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/11782335633.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/94706091555.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/22783267077.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/warutegobususirixopipova.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6549068e---kujoparigo.pdfIn PDF document text
    • http://santehnika34.ru/images/file/59666370158.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/59169794759.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/579262256.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/famibot.pdfIn PDF document text
    • http://elitk.ru/_files/3559106037.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/65857906751.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/47281674163.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/46360272292.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/pegizovarufeku.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/89600688896.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/48531174018.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_3D3E00F9C3C7864B.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/wasaxijijawufunudak.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/95324174392.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/wimamigo.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/76659253600.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_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 17444 bytes
SHA-256: e5263211f7669c4409247d57b856f0146058fe1590947d1cddad12d92aba03bf
font_02_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10340 bytes
SHA-256: e8ec3943bb81cd2682eabee64b5fe969efcac30ece2b44a80a71352a755d4546

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