Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d81cf166ce745f…

MALICIOUS

PDF

98.7 KB Created: 2021-04-15 10:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 80430bc8dcaa7303606459efae6561b6 SHA-1: eb99934d4b2a3498f646aef4a30433dd8f45d2de SHA-256: 11d81cf166ce745fb03594fd3a0bddded0f9d6a7040ad469bc908e4827809edf
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 0.9985

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://ponafet.ru/strik?utm_term=best+tqm+in+capsim PDF link annotation
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/nexebadarewosog-javomad.pdfIn PDF document text
    • http://asta-stroy.ru/sketchup_free_tutorials_2020ps8ph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_606a28fadf463.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/jumof.pdfIn PDF document text
    • http://aromaita.space/82502942746d4sb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_601f82e8dbe55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_604067e0c7ab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475728/normal_5ff6c3d7dc2aa.pdfIn PDF document text
    • http://morosoxumexax.iblogger.org/xetisepizife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_600abbc45fbbe.pdfIn PDF document text
    • http://itfamily.pro/e_with_accent_french_keyboard0zevi.pdfIn PDF document text
    • http://profapp.pro/did_kanye_west_wrote_the_book_of_yeezus2gmve.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/dabemuzunuduvoni.pdfIn PDF document text
    • https://mifokidosunatav.weebly.com/uploads/1/3/0/9/130969664/xagozutomatuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dasutako.rf.gd/16604593970.pdfIn PDF document text
    • http://xitemefunugege.epizy.com/2007_lexus_es_350_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8554699-6e49-4424-9788-a8994e3a9839/italo_calvino_invisible_cities._harcourt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d67ccf7-63f3-4f4a-831d-22b8cf0ebfe2/why_is_risk_perception_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccb874f-6b9d-4cd0-93e5-d3472dc08414/msc_biochemistry_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52aeaa2-41aa-463c-8da1-02320a48f971/how_to_use_a_plug_in_timer_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e5a272-aa0f-4962-8b02-6a2e02cc67d6/chewy_american_journey_wet_cat_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc999869-27f8-499a-92a2-1e693ac08e58/zoom_505_guitar_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6ba85c-f8de-42d0-8718-d3e96df8f7a4/63784597283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaecf4e-6be2-4abf-ab69-42390e34721f/can_i_eat_apple_and_orange_together.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c5040d-6a92-49a6-8bfb-64ded2ab9439/what_to_do_when_iphone_icloud_storage_is_full.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_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 5128 bytes
SHA-256: ee37dd61ef80b073650694f5197f90987a5b49c46719a12742202a7bb751c48b
font_01_sfnt_off0001535e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535E 11760 bytes
SHA-256: b6a639f58da015ae75d57333338177d68a8a28049026cc731eee2cd4ccdea6fd