Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bb5be915ad536c…

MALICIOUS

PDF

72.2 KB Created: 2021-02-17 10:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9417c73cfab7179d559ed18de06f6326 SHA-1: 90fbd6960d88fd5147710f1f196b28db67b43657 SHA-256: 37bb5be915ad536cf659bcbc7b84c5c2abd848cf71ccd5c87b17617e03a9c45a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=magic+the+gathering+deck+building+guidelines PDF link annotation
    • https://cdn.sqhk.co/pilozarager/hc68jdO/3599761527.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/tuxiridet.pdfIn PDF document text
    • https://rujikanonige.weebly.com/uploads/1/3/1/8/131872107/zogasororixorikifu.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/subexolemuj-kefutu.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/jaaHmhi/94953630239.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/5791d3c3036c2.pdfIn PDF document text
    • http://itdiscounts.info/three_year_old_worksheetsh7lu3.pdfIn PDF document text
    • http://skywonder.space/5057950270m2ifq.pdfIn PDF document text
    • https://masodorenos.weebly.com/uploads/1/3/0/9/130969057/1064697.pdfIn PDF document text
    • http://ig-copyrightnotice.com/viwafigufefuj53v9.pdfIn PDF document text
    • http://fringigejy.site/powerpoint_gantt_template1w8oj.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/xalam.pdfIn PDF document text
    • https://sotoxitubomiv.weebly.com/uploads/1/3/2/6/132695919/331650087b0.pdfIn PDF document text
    • http://vizionsmc.net/pegutejipajekuzigipjxqn.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/mEjcugg/guided_reading_activity_foundations_of_government.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/faxivavigigufirapaxe.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_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 5412 bytes
SHA-256: a54142b29cee321b4017a81403dd135932540de2bcd25864104668812ffec666
font_01_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 10164 bytes
SHA-256: 4900084f149b3ca7ef033699d40f384c55a391cb98ae799f8b91767914ec3611

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