Malicious PDF — malware analysis report

Static analysis result for SHA-256 86764d961fb2a88d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-10 08:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f77bd4e0af8c00bc2c3f4ad4c37c65b4 SHA-1: d6d4c6723cb6c1c5c24ac94e29bd292148d09cd9 SHA-256: 86764d961fb2a88ddcd72f0b7efae70418576c40bb23cd061787bebcacd22441
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-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://dugedepap.ru/aws?utm_term=how+do+i+sign+up+for+obamacare+2021 PDF link annotation
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/9303571.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/sifekufup.pdfIn PDF document text
    • http://foxeletumirud.iblogger.org/dirt_devil_featherlite_filter_f1.pdfIn PDF document text
    • https://ninitirasaru.weebly.com/uploads/1/3/5/3/135317350/nitirefowafedi_sulep_sisobuporos_jotet.pdfIn PDF document text
    • http://betabudon.iblogger.org/business_in_one_box_free.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/8a1412c3-9cbb-4724-b8ef-97994b2eb093/dosidaguzojunutinur.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_511f9084166a46998f3f7fc835bdc59f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d317e7e8-7123-4b17-af77-b652bc72f2b0/konica_bizhub_c224e_admin_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506c9a60-dae0-43ec-bbc0-a43461786784/what_episode_does_asta_get_his_grimoire_back.pdfIn PDF document text
    • http://mofuvuziwoloj.epizy.com/panasonic_kx-dt343_change_voicemail_message.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/hreflang_google_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/windows_7_activator_free_for_pc.pdfIn PDF document text
    • http://mefabimunusor.epizy.com/21752247176.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/likojeratogeziselel.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/53395884900.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_075b4a64f90c444c98be4e6b0171ff7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/grandview_heights_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/fupigupododizetesogejori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bd544b-8dcc-4ea5-8270-6491b47b45b6/gepefiponamukizina.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_37ce3a3f3c3742cbb68f2fbbd5866036.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_58abd7f3acda4a74bb85840f7e2584f8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5964 bytes
SHA-256: d09cd91396e5d8dfbef0ae2218dffecdcaa812d00454ba12ba59a641776c016e
font_01_sfnt_off0000fe09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 11292 bytes
SHA-256: b44a4d1a37d466265d9907cc4e3e67d258923832333270634cf87eeedb351b35