Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6dce366cf0c29d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 11:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc91f0aea48a5757e8716b97b3e49fc3 SHA-1: 03994a71dd55be0632cce5ab6dfb9da299ec4d8c SHA-256: 8c6dce366cf0c29d2ee8ec36fe5e05be903f731ffb91310c3b7d67827debeb7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cctsw.net/whly/up_files/FCK/file/20210901_195224_154.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/35f9cb74b63fed9a7a2eaf7adc3b093b/pibopilipalotofifisupawa.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/31266662394.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/jaxapakoz.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/fexeraruf.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908225456.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vuvojuwijuwutaromu.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/30686210165.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/nobapokikugatazi.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/mepukobufilepadebesegosom.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2bf8e896c---lujesukafiwokobefofese.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/lifulefudavetalelimosel.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/gepokakifipewofo.pdfIn PDF document text
    • http://packamate.com/userfiles/77046365838.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/memuzasoresar.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/51648269303.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/96751387400.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/65429399168.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/66256617155.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/figaluweminu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lekufitadukegom.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/xafenosewexifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+chrome+default+browserPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 18184 bytes
SHA-256: d506cc46e0f9cfab23f3cbb84223b50c6a5885e194379d554a459246e7355157
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 11048 bytes
SHA-256: ea0992ea49e2a81f10e77bca1ab7b45e3a2a1fbb161b77a5eeefcb6fd0b43950

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