Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5a008571ce1d97…

MALICIOUS

PDF

76.7 KB Created: 2021-01-24 09:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e7920f2bdb9a28ec7506ec14dfe62fc5 SHA-1: 940ab3573c04f58372918a1206fe8e484d74076b SHA-256: 8a5a008571ce1d97c81a9ed4339e725e5a7308d8a8af808ce0e97a86b17fcd8a
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 a machine learning classifier, indicating it likely serves as a phishing lure or malware distribution point. The document contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=jak+and+daxter+ps4+trophy+guide In PDF document text
    • https://cdn.sqhk.co/wuzededoz/EjjvyDZ/jibakepamej.pdfIn PDF document text
    • https://site-1197330.mozfiles.com/files/1197330/39179329438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415046/normal_5ff8819192960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5feb24e0ab0cd.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/gdd4iaV/full_steam_staffing_stockton_ca_95207.pdfIn PDF document text
    • https://site-1175829.mozfiles.com/files/1175829/tetrads_form_during_synapsis.pdfIn PDF document text
    • https://cdn.sqhk.co/bimowikosaru/dbMjahh/9134201958.pdfIn PDF document text
    • https://site-1174269.mozfiles.com/files/1174269/ruwiredemewilixurexefo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fc5bc7b5cbf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5fd8174172d23.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/iiHNKzs/zoxuwosegurovas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefuxaninegug.epizy.com/81220387065.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/everytime_britney_spears_sheet_music.pdfIn PDF document text
    • http://guxajez.rf.gd/escape_room_game_level_11_answer.pdfIn PDF document text
    • http://fetewuzapozoza.rf.gd/53359705739.pdfIn PDF document text
    • http://gevegure.rf.gd/jafomag.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_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 5500 bytes
SHA-256: c299bb6abf4485cccdfcbb51001ad5b785baeb80119243c897707e450e5e0175
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10676 bytes
SHA-256: 8a1436cd8839032d01fb290898e3dd086c4b161344e6355fa2319b9cb081ecd9

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