Malicious PDF — malware analysis report

Static analysis result for SHA-256 b943498810481d10…

MALICIOUS

PDF

74.5 KB Created: 2021-02-18 01:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 90550a3bbede8e92d603de0254e8718c SHA-1: e4af8ddb7e7d982e58afe21c13d90b1cca455d0f SHA-256: b943498810481d10294451751dfa9b7e92a95ec0500b876f9239bf6652b8bc55
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, appears to contain text related to Excel functions, likely a lure to disguise the malicious links.

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://yafferge.ru/strik?utm_term=what+are+the+basic+math+operations+and+functions+in+ms+excel In PDF document text
    • https://cdn.sqhk.co/lojosexotak/eQgjNji/mubejunosebogolenomi.pdfIn PDF document text
    • http://allieshouseofhope.com/arinc_429_data_bus_formatudumm.pdfIn PDF document text
    • http://takipleskazan.org/19795301470yuu0r.pdfIn PDF document text
    • http://komamoj.22web.org/asymptomatic_hyperparathyroidism_guidelines_2014.pdfIn PDF document text
    • http://216tilford.com/wolesotojazawulamorh9tmi.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/hpgfRYc/beautiful_wallpaper_hd_images_love.pdfIn PDF document text
    • https://cdn.sqhk.co/silijebutu/ha6geje/north_star_dodge_chrysler_jeep_san_antonio_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/igcgc4F/livobinetagupirinu.pdfIn PDF document text
    • http://pabesubibo.66ghz.com/duxitekuwululomagaju.pdfIn PDF document text
    • http://motivawka.online/bemopozapinoudgcy.pdfIn PDF document text
    • http://zoomita.fun/980778799817yisy.pdfIn PDF document text
    • http://yazansoft.com/tinenasiradesenomgiy0.pdfIn PDF document text
    • http://hargotel.xyz/45095559195x6xld.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/iSgiSjb/wuvos.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/mavatoniwojunumarudes813w8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panaxeberagi.epizy.com/difaxu.pdfIn PDF document text
    • http://ligunatiresid.epizy.com/filmywap_bollywood_movies_bo.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5616 bytes
SHA-256: d1f8c0206e0de7c8083cefe6122d66969159f6c177a8cc166871478f3a54d1f2
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 11444 bytes
SHA-256: f30265adc73cd162c76d2107b652f52bdb97810e1c769e2e3c1c1df4bcf08f5a

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