Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5de3b7afa35dbbf…

MALICIOUS

PDF

69.3 KB Created: 2020-11-11 09:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0b0a52f47d849df203e3a43a92e399b1 SHA-1: 8bb8372ac98bf3dbf4327fbce9f218ae0a4418f2 SHA-256: d5de3b7afa35dbbf6b27846ca705cb284998d0406be0fa878f51362283a4d020
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and point to redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads. The embedded URLs are the primary indicators of compromise, leading to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?keyword=stock+market+cash+flow+andy+tanner+pdf In PDF document text
    • https://jikiwifapa.weebly.com/uploads/1/3/4/3/134338998/4120917.pdfIn PDF document text
    • https://disadaniti.weebly.com/uploads/1/3/4/4/134463451/6858667.pdfIn PDF document text
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/menamuduvu-kunokedasifude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5f94778f6da13.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/f22694.pdfIn PDF document text
    • https://jojavofeze.weebly.com/uploads/1/3/4/3/134395471/serokonuxu_jawereg_vudab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5f942f60c0f46.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/mukubutiza.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/264c9c9c-ca71-4ca3-96e4-877f1c2631e3/8083206183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a1a44d-1f5c-4027-a32f-d9283237099a/kayla_itsines_bbg_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018509a6-3150-4774-bb47-05620011a1d0/40_times_escape_level_35_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09b9cda-33e7-48e5-adeb-a8f23e549863/pride_and_joy_stevie_ray_vaughan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3aba97e-f214-4989-96f1-51f36653e558/vivogegifagijurovowid.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/38558476972.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/cbro_value_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183cbf0c-409c-4a4e-b04c-411620595c5e/moriya_shrine_touhou_8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 5756 bytes
SHA-256: 4cb7c310723396de0668e72d21e6067966f6c169a39dd21e0a61465eaf99f462
font_01_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 12396 bytes
SHA-256: 0ee035512bfb98847449011f161b580b43cf7a4c44e1c4df4a987e069a1a1329