Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d7d17465b51086…

MALICIOUS

PDF

89.3 KB Created: 2021-04-04 18:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ba69d3a3bdcb120e384cf70c05fb12df SHA-1: 55539cc50492dbbd71cf736a9b4d69fc39540e4b SHA-256: e6d7d17465b51086d18a0b560759e0e8606b6e1bd58f2badd394998457969ce3
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, disguised as a helpful guide. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/aws?utm_term=how+to+reset+a+whirlpool+cabrio+washing+machine PDF link annotation
    • https://cdn.sqhk.co/vamapoludi/NjhK7rE/ten_pin_bowling_near_me_open.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/Ly4Lgem/98189197210.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/ecd8e11f0e159a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_604826d55fb75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_60380faebc5eb.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/dbjjic2/radio_musica_trance_progressive_goa_psytrance.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/oXhjyj3/are_all_cations_metals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_60412d1bbd125.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/F9ghHji/ladalonemorogatoj.pdfIn PDF document text
    • https://fofexajadovobu.weebly.com/uploads/1/3/4/7/134711713/xawopixomitidema.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/taluluva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_60287f7c8ea3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd76d6083bf3.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gKbVjMX/4k_video_live_wallpaper_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/406df21e-94ed-43dc-b600-026f3d475964/4979374032.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_5adb70cdadd44f5ab3b070232a2526cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9895a1-97ee-4f2e-9e83-2acc6d209236/do_psychologists_have_mental_problems.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_9142aefc4c4d4c4f87ea235943c0dd06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0c22be-93aa-4127-a435-b7918aa1dfee/60559469279.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_3ea7e9674df549efb2212eeca7d7639b.pdf?index=trueIn PDF document text
    • https://ad217471-f301-4d07-b05b-71cdb813ff8b.filesusr.com/ugd/4f915f_283f782cb76d4c928a8b12202e93298b.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_22d30d7b02f04d188ae88b94c465693d.pdf?index=trueIn 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
    • 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_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 5540 bytes
SHA-256: 02516cb13115c94a3dffb707e544931e99ceb1ee6fa331a93aed930054ede487
font_01_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 10840 bytes
SHA-256: 274112256f718106119c51ef104f217df6c29db168770fe187a9b37fb1b153e8
font_02_sfnt_off0001420b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420B 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f