Malicious PDF — malware analysis report

Static analysis result for SHA-256 859d35e09b65464d…

MALICIOUS

PDF

73.6 KB Created: 2021-04-14 13:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fa0f27b56c6fccca187448edb4c6cb95 SHA-1: f759815af0e8a48a5ed36b6ae2dc558d85cf3ba3 SHA-256: 859d35e09b65464d4ccde631f212688d143e284c7a1e055d5be954d10d325a9f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with one specifically pointing to 'maypoin.ru/strik'. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the PDF is part of a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of external URIs and the link farm heuristic point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://maypoin.ru/strik?utm_term=multiwii+2.4+bluetooth PDF link annotation
    • http://fovorowo.22web.org/psicologia_procesos_cognitivos.pdfIn PDF document text
    • http://sunuxew.22web.org/xamudarolozaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5fe5aa63ed067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_5fe81673e3a0c.pdfIn PDF document text
    • http://ziriwurupi.22web.org/8753221659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixukad.epizy.com/aimersoft_video_converter_full.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/70790364139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a007ad-1d30-4a9f-ab47-e4f520a7dd36/fupekizanidise.pdfIn PDF document text
    • http://kawixowovisekek.epizy.com/manual_acls_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0585265b-ea4b-4915-97e5-7035dab5a486/due_diligence_checklist_real_estate_investors.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/zagg_folio_for_ipad_pro_9.7_backlit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4ffd47-0875-4e4a-9f1e-0c84b6f113e0/who_rules_the_world_noam_chomsky_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00d26f5-afd7-4e50-883f-d9b9f7d9b859/31700920908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f1b256-1f3c-496e-a92d-948c3502d207/soundpeats_truefree_true_wireless_earbuds_bluetooth_5.0_review.pdfIn PDF document text
    • http://kidaberotumopog.epizy.com/vosawepapafunu.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/kugavezovewibeduwuloga.pdfIn PDF document text
    • http://wipedeposadav.rf.gd/60986142029.pdfIn PDF document text
    • http://diwukimip.epizy.com/xumugojavatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32681e76-40a4-43d6-b3a5-b9843cfb1bb1/bitusulumapime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4029b1-4df6-4804-bba7-4f61abea9af7/how_to_solve_cronbach_alpha_manually.pdfIn PDF document text
    • http://limidiladafa.epizy.com/wefuxisuwel.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_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 4776 bytes
SHA-256: 59f256587532de6d80caadde696b928a540fac022277ac6ebc09e92d187c2b75
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10860 bytes
SHA-256: b35fd5e527c43b8a80e60c2da107a29d92b8fab1eeb7d7139057356635e53d0a

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