Malicious PDF — malware analysis report

Static analysis result for SHA-256 f167d56c7d0ef494…

MALICIOUS

PDF

80.9 KB Created: 2021-03-26 07:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 389ac9572677b19af4825157889deaf0 SHA-1: 974d0074a97ca6489dcf8713179626077e64e853 SHA-256: f167d56c7d0ef4940498a626402905c22f3d42383dc712c979b33b90f1d91035
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/123?utm_term=happy+birthday+sister+video+song+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5fdb7a233aa51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_602f95d2666d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418192/normal_6026515783ae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5ff00b620d635.pdfIn PDF document text
    • http://zumubexupon.22web.org/8057999116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414336/normal_6005e77d212fc.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/google_drive_login_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fc5d95a0d385.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_5ff1b3afc8d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_60439681b2a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_6052b40b64d67.pdfIn PDF document text
    • http://divoposolabuv.22web.org/adding_and_subtracting_real_numbers_worksheet_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdfb155b93e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fd11b80347de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_605d690ad8e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_60385a2f04a7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xuzixezo.rf.gd/what_is_the_best_breathing_technique_for_anxiety.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/the_heir_kiera_cass_wikipedia.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_f857030016cb4563af27b25fac661c59.pdf?index=trueIn PDF document text
    • http://rulamiji.onlinewebshop.net/bupige.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_a01c857eed8a4e709cab8f12b3271112.pdf?index=trueIn PDF document text
    • http://gogivibemijukag.epizy.com/ramufufukut.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/merenawug.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 5320 bytes
SHA-256: f3c9c00df7f5caebc95f85753a8eefde074cf2b95416f610a9fb428c0a2b7dcb
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10688 bytes
SHA-256: 81ec6b49afe827bedc16ded048deeb5963d1d81eab11e0e35d88b635549adc06
font_02_sfnt_off000127fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2