Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fab63802444e90…

MALICIOUS

PDF

84.2 KB Created: 2021-03-15 20:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d93ca257be93b6aa1f1d88b3712f0dfb SHA-1: 1a61c72eb47bf7d192c86254794a78b6b20d6ac4 SHA-256: 32fab63802444e901cf8b6c02b36bc41d84bd8a42d0cb82d9213e205466219a8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malicious content or phish for information. The ClamAV detection and ML classifier further support its malicious nature. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to dafemum.ru, which is likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=cengage+organic+chemistry+pdf+quora In PDF document text
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/xigifevavekuti.pdfIn PDF document text
    • http://fortuneocredit.com/11398387350rajdl.pdfIn PDF document text
    • http://nigma24invest.online/atif_aslam_all_bollywood_songs_listlnbzd.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/9220f64afc04.pdfIn PDF document text
    • https://fazapezipomen.weebly.com/uploads/1/3/1/4/131453522/jatoxerepavik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_602e24a8296c1.pdfIn PDF document text
    • http://trysalon.xyz/gogo_live_mod_apk_chiaseapkkdlgz.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/wafamadara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fc6f1705f6bb.pdfIn PDF document text
    • http://uchebnoe.website/mulan_reflection_flute_sheet_music5nclm.pdfIn PDF document text
    • http://jetinaxisodew.mypressonline.com/whirlpool_cabrio_platinum_washer_error_code_sd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5fff458cc19c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5fea381717044.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/bubuxuzadabif-zosadaxapefo-bukapefix.pdfIn PDF document text
    • https://nozudepoget.weebly.com/uploads/1/3/1/1/131163917/7301218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcdafc248e42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaduzos.myartsonline.com/28093582265.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/v1_v2_v3_verbs_list_1000_download.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_dc00cf83ecda4c8eb05af93f8d6a52d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/14664922098.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/expressions_allemandes.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/74234825325.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/descargar_biblia_reina_valera_1960_gratis_para_celulares.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_2296261d32d4485aa2c5958ca8bf85f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/47533568632.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_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 5668 bytes
SHA-256: bda841562b33f46dd023fb10f11ec272771386e32f7d460bd9960bfef578384a
font_01_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 10740 bytes
SHA-256: 3b3f35cf926f130eabdfe004cad021334eefdcf940fb42844b36825675290d39

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