Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a13653f1949089…

MALICIOUS

PDF

77.7 KB Created: 2021-05-10 03:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 45bca35fa19ed9efa9e40ce77f0c1cf5 SHA-1: 26c3460f998205cae317f2c5a3af8791ba6de71a SHA-256: 47a13653f1949089d6e78743f5650036ce9d78df777c19e8e00dba8d07bf440b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with a deceptive title related to Excel. This strongly suggests a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=how+to+use+fuzzy+lookup+in+excel+2010 PDF link annotation
    • http://gebameguw.iblogger.org/cantos_de_alabanza_y_adoracion_catolicos.pdfIn PDF document text
    • https://lezovijun.weebly.com/uploads/1/3/4/8/134865909/telida.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/ifxin5G/2243405241.pdfIn PDF document text
    • http://wemigime.iblogger.org/jebug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_604828ffbe75d.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/je6gehe/premiere_theatres_goldsboro_nc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fd3b2e7edf51.pdfIn PDF document text
    • https://jixunurawut.weebly.com/uploads/1/3/4/7/134743206/8370433.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/0hcxohc/download_songs_mp3_free_for_mobile.pdfIn PDF document text
    • http://lavorunolutoga.22web.org/31830495778.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/2452355.pdfIn PDF document text
    • https://dixetomik.weebly.com/uploads/1/3/4/7/134775969/dijog.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/zhfjegg/war_of_the_buttons_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/DhgGEij/pitutatajiz.pdfIn PDF document text
    • http://favanitum.iblogger.org/lexunazisukovetilevodokid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_1c3a12fec97046d790212136ab1a5920.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_c0fd3a29732b47ebb16dfdeab8a81b45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/duxufewetuwijeni.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/99294984211.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_4be938a45b5f4cd3b03edb0f15ed726e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pilazi/dell_optiplex_755_driver_pack_windows_7.pdfIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_9e6d5f3190b34aefba20c803bdc7c800.pdf?index=trueIn PDF document text
    • http://jefusebu.epizy.com/gemusopofubupapeki.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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5364 bytes
SHA-256: 78a8bfc403cbb4ec53ee907bab9284b1f0517e30ce24f3431d1c3c1a2a4d8e5e
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10424 bytes
SHA-256: 5104523b029d6c89aae8d6e5dde73286b13ac2670d25c0fec515c76fea59e7c2