Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bafb3f34f11212…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 14:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2cd03844a3831ed7382e3fff69584f49 SHA-1: f7d7c3f239eb404758c0c2a104ebca77e813b9a1 SHA-256: 87bafb3f34f11212fa18d030a2ee8e23f12a5e7b110c104f87621bb0a04a62d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=hamilton+beach+coffee+maker+46205+replacement+carafe PDF link annotation
    • https://cdn.sqhk.co/gixotagokezu/ghjcjb6/75052013546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_600688b8ee1c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5ffec116a4373.pdfIn PDF document text
    • http://sdek-24.cc/rutina_abdominales_isometricoshbna0.pdfIn PDF document text
    • https://xalemewo.weebly.com/uploads/1/3/4/6/134665704/a9a265475ad711a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_6019dd50499de.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/4af19c153.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/sjakgfD/nfl_scores_week_12_2019.pdfIn PDF document text
    • http://urolog.xyz/how_to_transfer_mobile_number_using_pac_codeumrnq.pdfIn PDF document text
    • http://manthoughtswebsite.website/neha_kakkar_new_song_download_wapking2eiex.pdfIn PDF document text
    • http://siondez.ru/how_to_make_a_large_dog_crate4nyil.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/nurelogez_dugewezavalulem_makipavejexoxe_gukubudotav.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/aad1d1bf-66c1-4489-86b5-2562fe2323aa/nunofipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e336148-7b11-4035-ac24-e0bc53132d14/what_is_the_roman_catholic_breviary.pdfIn PDF document text
    • http://jopubulebava.rf.gd/susumanivenoxubagisikota.pdfIn PDF document text
    • http://valamujunitun.epizy.com/kugiwufum.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_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 5880 bytes
SHA-256: 0fcf54bcd6d67c3e2bfc11938121c9f248e0e362b933c12b430c8dd9beb76e7d
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10708 bytes
SHA-256: d2a5e14b1f236130c244ee7ea8a2c697e940c9b8ab43f7b9b3ec3988dd7459ec

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