Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bad1fa000b5e67…

MALICIOUS

PDF

94.0 KB Created: 2021-02-22 02:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 60768f731b70d1b61e35fbae94634c2a SHA-1: 9a78fc95dde171033136a50073195807f8dde337 SHA-256: 25bad1fa000b5e67cb849736df6da542f38121bc0698df3f2456ffb08f61d9ee
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various external websites, many of which are hosted on disposable domains or known redirector infrastructure. This behavior is indicative of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=soccer+stars+unblocked+76 In PDF document text
    • https://tejalegevususo.weebly.com/uploads/1/3/1/6/131637178/pitigaxol.pdfIn PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/9195949.pdfIn PDF document text
    • http://newyearshop.site/costing_format_for_manufacturingjcab8.pdfIn PDF document text
    • http://fenellalucynelle.info/how_to_port_out_google_voice_numberbuotr.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/hjjdjhY/wabatipotesagizitokoxig.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/keruredugugami.pdfIn PDF document text
    • http://lenudes.com/64985970101z7uaa.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ahbhiic/spin_royale_app_review.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/govirobetazap-kejavowavi-kagefur.pdfIn PDF document text
    • https://vudolexululuj.weebly.com/uploads/1/3/1/0/131070894/2228174.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/regumigajesubu_xitek_kixefidimat_wufuretamu.pdfIn PDF document text
    • http://snt-br.ru/how_to_draw_gear_teeth_profilesoeuu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/87004192920.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 5476 bytes
SHA-256: 2ce80bda95a5ff63c25496ebeef0c6d1366729fde3beac2461470c460166a4df
font_01_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 10756 bytes
SHA-256: feb6e2aa80f0e79a5ef2b285063fc3a76a6ec80e619e3d40a1ad3805951d24bb
font_02_sfnt_off0001564c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564C 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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