Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b2da365ae03507…

MALICIOUS

PDF

100.9 KB Created: 2021-03-20 12:28:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7549b426f4a8bd5a9bc61b88ae7d9a51 SHA-1: 921718f053c976c6a285f9cee1a6dbccebcb9ded SHA-256: f8b2da365ae03507958d9275124c2403eed6bb001972eae7cecdce485e26860a
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 0.9986

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://midufefew.ru/123?utm_term=arrhythmia+treatment+guidelines+ppt PDF link annotation
    • http://metryck.info/1977_dodge_sportsman_rv_specsy8th0.pdfIn PDF document text
    • http://zegosuvavanow.22web.org/50724212006.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/lovol.pdfIn PDF document text
    • https://bafewalu.weebly.com/uploads/1/3/5/3/135350628/289465.pdfIn PDF document text
    • http://agencymedia-ig.com/49595936854x08cp.pdfIn PDF document text
    • http://reznitskygallery.com/migomabisefuneviranop35j11.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/ba052c574250ec1.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/xurefumujafedimikag.pdfIn PDF document text
    • http://ryduslim.website/computer_parts_information_in_english82kkj.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/1033195.pdfIn PDF document text
    • https://mitezexevas.weebly.com/uploads/1/3/4/5/134525922/5215106.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabizawez.epizy.com/cuando_cortar_el_cordon_umbilical.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/44060556294.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_0eaeab8751ec404595215191126a88e6.pdf?index=trueIn PDF document text
    • http://kileduf.epizy.com/digital_poetics_an_open_theory_of_design_research_in_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/bakusapukutaguju.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_674cdbf7722440c0982f4be7fa6d7729.pdf?index=trueIn PDF document text
    • http://jujuletofu.onlinewebshop.net/63108007887.pdfIn PDF document text
    • http://fujatelet.epizy.com/derusifufepej.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_72f4ebce59314545959d141a8969265c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/67450611324.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_20785312290c4c1caad8edeaba324491.pdf?index=trueIn PDF document text
    • http://wenares.myartsonline.com/marketing_management_salary_in_south_africa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001402f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 2140 bytes
SHA-256: 830c6ac5426da24c970689465b24ea616f1a6c8c75a8a5de61e43dd7c8ef0d77
font_01_sfnt_off00014a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A13 5464 bytes
SHA-256: bfd4f963f88bcd25f543ba34b474590af57b967c51fc7e8a28a482ca2c7c2f4c
font_02_sfnt_off00015c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C87 11928 bytes
SHA-256: cfde985a64b992e3a2afd0a919d84a33770333f3204c79553d10487311ae7388