Malicious PDF — malware analysis report

Static analysis result for SHA-256 201dff7ebd939d60…

MALICIOUS

PDF

77.7 KB Created: 2021-05-02 15:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 57e8b055f9245c2d72dfb58c523629be SHA-1: 3d53bd1333608333b7118052386a3fcfe5a7fb82 SHA-256: 201dff7ebd939d601bc87512ed35599ab414a691dacd437997e2e304f4b9e892
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which is a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The primary malicious URL observed is zajinet.ru, which is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=hp+deskjet+ink+advantage+2545+wifi+password+reset PDF link annotation
    • http://sibefumunefeke.iblogger.org/29469836108.pdfIn PDF document text
    • http://rufejupewanun.iblogger.org/affluenza_book.pdfIn PDF document text
    • http://gotedez.22web.org/authorization_for_background_check_form_for_tenant.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minawibuwo.rf.gd/temikem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f783e2-b3fc-4a49-82ca-869959f49811/wu_tang_series_cast_imdb.pdfIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_38dd2f0e04e445848ef4f46e0889b30e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/ipcc_report_on_climate_change_2007_summary.pdfIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_365f467adcce42aca4be4216f760ed29.pdf?index=trueIn PDF document text
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_a8c2fe4b508847be847cc7d17ab3a986.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_2e9e2fe4b159452db075cf051b81dd6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/leine_linde_xhi_861_datasheet.pdfIn PDF document text
    • http://pubatamelobu.rf.gd/64490130186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03cc689a-2b35-4548-8c48-cd6f44ea194e/lenovo_t510_arbeitsspeicher_wechseln.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5563bf-32b5-4b31-a771-a2ca6ba165db/molecular_cellular_and_developmental_biology_cu_boulder.pdfIn PDF document text
    • http://rajafidaforuzav.epizy.com/bikifelide.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/vokibeduwoxibabubelow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8764e047-f32e-4e31-8bdd-8a5e3b98248e/who_is_behind_v_for_vendetta_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/zotiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91babc50-283c-453f-9152-da31e19952b2/modernist_cuisine_the_art_and_science_of_cooking_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93da345-9880-4bab-89af-a7b99190e0ed/bewaguwidimipujeloxiku.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_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 5776 bytes
SHA-256: b06d532ba6f582e215a57d6d5a6d6e7ecdb67422451b4cfa121563d095865a58
font_01_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 11400 bytes
SHA-256: af536df589a64c19de6eaabf722d07fb32a42c530cdd9b68dab53b90328551f6

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