Malicious PDF — malware analysis report

Static analysis result for SHA-256 3109fe8b2f530b91…

MALICIOUS

PDF

81.8 KB Created: 2021-04-02 10:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 67ed289917f5af0db7e6cd3efd3d2c38 SHA-1: 578b4cb58a0de4ac3cd2b3ea5225dcdb4864d3eb SHA-256: 3109fe8b2f530b91138bf65f02fd164abaabbd2184e8925ddf7abb3441e03a5c
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 0.9997

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://baarspo.ru/strik?utm_term=is+smart+car+insurance+worth+it PDF link annotation
    • https://cdn.sqhk.co/tedalome/gRGjhhf/jiwowivupuwezonod.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/ghAghjd/icloud_drive_dosya_paylas_m.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/jdmgiGl/92183935480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fed4290b40a1.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/eWic14i/operations_analyst_job_description_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxivuxovu/chdjcgf/school_website_templates_bootstrap_free.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/VXgcidq/bedekagotumojudidox.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/kenmore_elite_dishwasher_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/jijggjg/zorotudokimibuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5fd88834dc029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_5fe7c4e2c7761.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
    • https://s3.amazonaws.com/tugumeb/gejudi.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/comcast_dvr_recorder_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/bulacan_state_university_entrance_exam_reviewer.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_fb1f1e9576674a4fa471df181098a154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/apple_ipod_classic_30gb_battery_replacement.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_650f7d807ce84adb8a332bc3efad4e57.pdf?index=trueIn PDF document text
    • http://sarutufasiko.atwebpages.com/kyphosis_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/jadigegubutebop.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_4796ddd5146f41e19ca292b1ffb3c241.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 4920 bytes
SHA-256: 61a52710ca6d2ea216a6a5a2ceb9abe74f7ad334ea7d3bb556c95e5dd35c6c97
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 11260 bytes
SHA-256: 9544a4796c662ee181c78e7492d6fe968140da1339916dc07ac31ac951b02829
font_02_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c