Malicious PDF — malware analysis report

Static analysis result for SHA-256 38339b41eb20083d…

MALICIOUS

PDF

71.6 KB Created: 2021-03-02 20:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a21d5e4e594d8e008f15dcf433a43a89 SHA-1: 130a9f8e6ed41db45af945c8b0b7b874b1f90106 SHA-256: 38339b41eb20083d1e2bace5f38bc10c62cc241c6038791fd01649442dfedaeb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://botokaw.ru/award?keyword=ottlite+wellness+series+wireless+charging+desk+lamp+costco PDF link annotation
    • http://fajiriduxir.medianewsonline.com/motorola_walkie_talkie_mr350r_charger.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/no_game_no_life_characters_boy.pdfIn PDF document text
    • http://mini-cam-v2.club/8725331152097rfs.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/nivexupaxanozekanodanolez.pdfIn PDF document text
    • http://am-sound.ru/89432282857b6kjr.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/vexufu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beliraguw.onlinewebshop.net/cool_female_st_bernard_names.pdfIn PDF document text
    • http://bafopivazizaxon.rf.gd/mount_and_blade_warband_viking_conquest_serial_key_2020.pdfIn PDF document text
    • http://nazopagoja.epizy.com/checkbox_html_css_template.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/zunubipu.pdfIn PDF document text
    • http://fisumude.rf.gd/a_fine_balance_by_rohinton_mistry.pdfIn PDF document text
    • http://sewoxoxitif.rf.gd/93334575058.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/john_deere_950_tractor_engine_for_sale.pdfIn PDF document text
    • http://jolivawojo.rf.gd/63659880179.pdfIn PDF document text
    • http://wexavow.epizy.com/taviluwafom.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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 5672 bytes
SHA-256: a566e2004a43343f793f9106a10bbc85d68c1ced93b5ce23a9e1e3e94bf764d4
font_01_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 11136 bytes
SHA-256: 298dc34c492041982653a3a68ec99708490741d9a0da1644045a5904d6f5fcba

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