Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e512591d78399a4…

MALICIOUS

PDF

77.0 KB Created: 2021-01-14 05:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2e052e6d75524fd0c2c904d6b33724ff SHA-1: 15e498e3a18d9c812906d05fc32576a9b4d7bfdf SHA-256: 3e512591d78399a423265fab2026661988e5f7c7dd1f4f1a825f05f4c534a899
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure (ggtraff.ru). The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'chess for android apk' and 'wkhtmltopdf', suggesting a lure to download potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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 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://ggtraff.ru/aws?utm_term=chess++for+android+apk In PDF document text
    • https://cdn.sqhk.co/rafatuvolix/ihglmja/wedinoregadiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f8db34637296.pdfIn PDF document text
    • https://site-1177746.mozfiles.com/files/1177746/mystic_messenger_jumin_route_call_times.pdfIn PDF document text
    • https://site-1177097.mozfiles.com/files/1177097/pagikavubunipebusagaz.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/9ef0236c2657.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/icifghy/xosejesikujadifo.pdfIn PDF document text
    • https://site-1168112.mozfiles.com/files/1168112/vitamin_d3_deficiency_symptoms_mayo_clinic.pdfIn PDF document text
    • https://vesivugabe.weebly.com/uploads/1/3/4/8/134881415/wibafani.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/Diighn9/mewe_stock_price_today.pdfIn PDF document text
    • https://site-1177392.mozfiles.com/files/1177392/dinosaur_battlegrounds.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/69724998670.pdfIn PDF document text
    • https://www.aartbik.com/android_manual.phpChessIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE49 4892 bytes
SHA-256: e6fa964b2a8ecf45935c68fb460117f518c765e2b7136d87e5fec6617546e894
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 11352 bytes
SHA-256: 63cd5081121a96b5343b6bd882abfcd0daeefc3f46b5d27f8c33a5df649870b9
font_02_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
font_03_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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