Malicious PDF — malware analysis report

Static analysis result for SHA-256 8659f960586dd11d…

MALICIOUS

PDF

65.9 KB Created: 2021-01-17 10:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0ad47d5c9a434076470e5b6c78b7d74 SHA-1: 7750004e3a879ee231841ea4f82d7f40fe66b415 SHA-256: 8659f960586dd11dcbe895eb680ffd2c79a9ce6552bb47154380670cafe1579a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gettraff.ru/aws?utm_term=audio+soundtrack+free
    • https://site-1256828.mozfiles.com/files/1256828/my_talking_angela_mod_apk.pdf
    • http://xefakuwejufo.iblogger.org/brushes_for_illustrator_cc_free.pdf
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/xuxozodorozus_bulanafavita.pdf
    • https://cdn.sqhk.co/zofizitene/iiE93jg/manga_studio_6_free_download.pdf
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/gimagukajijejabutur.pdf
    • http://xajaweronasuxo.22web.org/82310581209.pdf
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/xewumurusojexoziru.pdf
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/koleg-wufewaki-tukigaxowaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/donukadizolin/wipasevekapinafoweloji.pdf
    • https://s3.amazonaws.com/sizabo/phenol_chloroform_extraction.pdf
    • http://jofawapedoguw.rf.gd/multiplying_and_dividing_scientific_notation_worksheet_answers.pdf
    • http://ribezewipuzez.epizy.com/react_dashboard_templates_free.pdf
    • http://gasigigi.rf.gd/nigatepiwajoral.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c65e.bin
7e5b27454a34167d97c38cdb4d42107c08b387fadaa70bf8256f3814891094c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 5036 bytes
font_01_sfnt_off0000d793.bin
ae7f438951ed8053fb0f23d26f2b77e29d8d501ec037250c9e19004c8966d9c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 10308 bytes

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