Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf104a8f6c5e827…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 19:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0202458f0d45cebead6c21e305a9c696 SHA-1: 5653348ee5c8dc27285340ea95ea680403dcd831 SHA-256: abf104a8f6c5e8270ad91b3006cd6ecec6ba2f8bf065c2aa0b918b3ba1ef1835
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=julian+corrie+broadus+high+school PDF link annotation
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/ee8746ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_604a69aa3fcc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_604ae4a40e727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5feee6c5d6b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_60303d36c4039.pdfIn PDF document text
    • https://regamozinog.weebly.com/uploads/1/3/0/9/130969170/gelajupebom_kikezobovul_jotamikelefiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5fcc5d19bae4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457272/normal_5feb8e880197e.pdfIn PDF document text
    • https://botugesoxa.weebly.com/uploads/1/3/4/5/134509905/pomimusimug-xakulokope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445888/normal_5fe02f19f156c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_60340cb866492.pdfIn PDF document text
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/43e70ff7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467286/normal_5fee39083bd16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_5fdac4128d2f4.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/faxape_jozuvozaxosa_bexowanesamuv.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/26505278-6668-483b-9175-d49b1ea80172/dir-615_firmware_20.07_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7faf4617-76f6-44e3-8297-52b0ed7ff169/mosupitenupirigada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30819f84-e2af-4eec-9293-1a8706563b5a/como_solicitar_una_visa_de_novios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ab1d2b-f645-446f-a642-9de2f52ea6cf/singer_4562_bobbin_tension.pdfIn PDF document text
    • http://wuvasof.epizy.com/payslip_calculator_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf7e5e8-4e7f-4887-9347-e8cb37f89d4e/nissan_forklift_parts_catalogue_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f07169-849b-409a-9e7d-917c26b561c9/mumegovoxapojopidurufitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfd955e-e12b-48b2-84a0-bb9a9f1919bd/gossen_luna_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d552ce38-7d04-49a4-9b57-da1a627fa110/precalculus_fifth_edition_stewart_redlin_watson.pdfIn PDF document text
    • http://xolefodaw.epizy.com/8802784382.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_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 5328 bytes
SHA-256: fe997d843045ae4a3250fac29ff6381328043c4571ce09954753071cd1b4307a
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 10812 bytes
SHA-256: b1d5f7b0123ac0afa5d8853941c10866d6f08fe0d47f0b7f5ebdc64425e02827