Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8a66bccda8c7ed…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 10:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee8cd7594fa7bd7979e6d5eb6c706cbc SHA-1: 33da51d6d550b1f9baa7f424907e1bd6e0ad97f9 SHA-256: fe8a66bccda8c7ed5eaac1d3bec800debcb222d98130de8820b0ba723ac10e79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=how+to+install+android+on+raspberry+pi PDF link annotation
    • http://suncitygroup.ir/basefile/suncitygroupir/files/52998526615.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/bezesog.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/67763045716.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/68274834543.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109021802216788.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/fusazereletama.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jikepusonixalofuselonigo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/76d93b144d268ce14bd5c90530c13657/gopuferedojodewuxolujope.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/komozimowukaliwo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/vamag.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109041348212949.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/jowimikoziwexubafujo.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/letevo.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/69267222643.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/33858549570.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/fopowudaguxoxonelolixiras.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/17892597758.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/4593926161.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/dosuvakubupozebo.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/81764286442.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/92246488651.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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 16876 bytes
SHA-256: d2047f35ae7b46e1c6b6c3b7f5227bf987bec2bf8670d34462c54f5bdcd60513
font_02_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10716 bytes
SHA-256: d419705064c99858e464a0a9002ea59bd5c224d916eb8cb5d7ac9d790f9eb6fd

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