Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b28dd345a6a2a5…

MALICIOUS

PDF

77.6 KB Created: 2021-01-14 07:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 03070b9031f8d7cadf79519eb55f53ae SHA-1: dd79c6f4b2b17ff989dd526b6eafe914fa8297e1 SHA-256: c2b28dd345a6a2a550a80a11d0a24218bd11595efcc87ad021424ae24e987af2
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of embedded links and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the nature of the embedded links indicates a likely initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffking.ru/123?utm_term=ego+dystonic+thoughts In PDF document text
    • https://cdn.sqhk.co/golomamone/Nhghdjg/how_to_cook_packaged_spaghetti_squash_noodles.pdfIn PDF document text
    • https://site-1168163.mozfiles.com/files/1168163/49528280366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f885fed8bfe6.pdfIn PDF document text
    • https://site-1178876.mozfiles.com/files/1178876/albrighton_primary_school_ofsted_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fa116933ebd5.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/gaxezolure.pdfIn PDF document text
    • https://site-1175062.mozfiles.com/files/1175062/fill_the_glass_without_touching_the_dish.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/e8u1ria/history_of_hindu_chemistry_book.pdfIn PDF document text
    • https://site-1173168.mozfiles.com/files/1173168/68604545142.pdfIn PDF document text
    • https://site-1168114.mozfiles.com/files/1168114/word_collect_answers_level_1518.pdfIn PDF document text
    • https://site-1168221.mozfiles.com/files/1168221/93507636693.pdfIn PDF document text
    • https://site-1176767.mozfiles.com/files/1176767/17914640052.pdfIn PDF document text
    • https://site-1178518.mozfiles.com/files/1178518/68763462599.pdfIn PDF document text
    • https://site-1172550.mozfiles.com/files/1172550/arnold_schwarzenegger_modern_bodybuilding_encyclopedia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 4924 bytes
SHA-256: 00ec7a7ae9cc6502f346bf5aba5c2af307b8ea8c8b2a9d4649b2008354208888
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 10828 bytes
SHA-256: eadb1767833de04a3327757158520ff387338472871f2c1349bd352c1de44e00
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 6048 bytes
SHA-256: 0f9ffb01bd7f62da26c8df7dfc1833b5437b9b6d5d046c5faa5e0bbe05dfd95b

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