Malicious PDF — malware analysis report

Static analysis result for SHA-256 872ff38630817cb5…

MALICIOUS

PDF

77.8 KB Created: 2021-06-03 05:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9ba14bbaa23f6803a486af420392393f SHA-1: 9bcd15e2f8d2a061d8a02566495d61089bc7fabe SHA-256: 872ff38630817cb5ca167b5fde417a12feaa489dd55c73933323c31e79bf82c4
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 0.9993

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://queure.ru/pbw?utm_term=car+loan+agreement+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484636/normal_606ba1a11b467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_60338dc39654e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496584/normal_5feff02d29c62.pdfIn PDF document text
    • https://magolusasuxagex.weebly.com/uploads/1/3/4/5/134585119/pivisatogupelivor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_60676839d5e01.pdfIn PDF document text
    • https://lidoporovumo.weebly.com/uploads/1/3/4/5/134506542/1565641.pdfIn PDF document text
    • https://tovefejuxula.weebly.com/uploads/1/3/5/3/135325554/6741105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_60355db26d5de.pdfIn PDF document text
    • https://dezilupogebog.weebly.com/uploads/1/3/4/1/134109094/5726997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_603e73f4b7df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_600f992bc0f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_601cf9493e014.pdfIn PDF document text
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/9623860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcac19b41471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_60304e1414db7.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/0a959345-7842-4761-8f98-54cd57a28481/australia_weber_q_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bdae37-055c-4d1d-8011-cbe9108ed9fe/linear_functions_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919c3490-551c-4e10-ba56-6a55b6424e73/boworebovawutebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b4dcfb-6b57-4ec2-a2aa-99e6c1d15a8b/2016_mazda_cx-5_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36df6ff-a200-4abf-b151-07e150686ec6/walmart_rca_10_portable_dvd_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5b7bc7-0bbf-4618-a9d2-0f44abe35aba/35852116752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44c7e9c-35b4-4295-a6b1-25bbbe6efedb/9th_class_computer_application_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f97f18-fac5-4223-8ad0-d65212c669a8/21133594589.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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 5088 bytes
SHA-256: a924df9577e919a042d659f63ad4662e5ad71a945c1da0541d738ee297a79334
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 11308 bytes
SHA-256: 7fcbee88fdcbe361b324651ec3424ed01b28a75cb5b511a65030fa93cf017fe3