Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cfa51450088393…

MALICIOUS

PDF

81.5 KB Created: 2021-02-25 02:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b5fbd5466301850e1f25cba42d09eae0 SHA-1: 86c1b77b0b7f4d70d6517b3dec469b608843c33c SHA-256: b6cfa5145008839314b721bb86e9c8c5719c2a25aa95b60897f9299943a833e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/strik?utm_term=medieval+2+total+war+games+of+thrones+mod PDF link annotation
    • http://muzibatixabu.mypressonline.com/jofotiliwesajivu.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/mixizasapuwiv-kuwodaxoweko-biwegukipox-femobolosarof.pdfIn PDF document text
    • http://begemotiks.space/zikejuxuvenafitwwm1.pdfIn PDF document text
    • https://cdn.sqhk.co/bofozuto/jjgjidK/64483196858.pdfIn PDF document text
    • http://help-copyrightservice.xyz/63614086367ppn2x.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/bixakejoginut-lapul.pdfIn PDF document text
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/5731372.pdfIn PDF document text
    • http://instapodarok365.site/57845362714w7nvn.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/gobizuxejo.pdfIn PDF document text
    • http://meetdouche.xyz/astor_piazzolla_libertango2ujci.pdfIn PDF document text
    • http://naykaryadom.fun/register_post_type_custom_templatef9zra.pdfIn PDF document text
    • http://nanolenka.xyz/minecraft_pixelmon_mod_wikijt9nj.pdfIn PDF document text
    • http://salebox.shop/bdo_the_ancient_weaponhg98o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fabodatutowew.epizy.com/togenodotalurewanamolivud.pdfIn PDF document text
    • http://sidiwen.epizy.com/50865109496.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/biwiwoforuvujepilepare.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_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 5612 bytes
SHA-256: b98d21461ab3f9536bc89716ed40cc3012f9f8723c241797b8e22f45a3071e39
font_01_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 11320 bytes
SHA-256: ed2fe1eb190ceb4edd688e6769b0f04392214fbc447d4d492403373a5e1fa73b

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