Malicious PDF — malware analysis report

Static analysis result for SHA-256 531daaf7ef44211e…

MALICIOUS

PDF

69.2 KB Created: 2021-02-17 23:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c0720a0d6fad296a43ee2be7dadcdbfa SHA-1: 27d85c92096264c45698ea34284b10177f999951 SHA-256: 531daaf7ef44211e96ae4712d7539eab28d62eb549dfa7a19233981df359fd31
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF's structure and embedded URLs point towards an attempt to direct users to potentially harmful content.

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://bologen.ru/123?utm_term=geometry+theorems+cheat+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6018ef441da4b.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/kesojul.pdfIn PDF document text
    • http://extrameets.fun/541910410296umb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_601ee04f29fb3.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/historia_del_veganismo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445340/normal_5fe51676b4fd2.pdfIn PDF document text
    • https://cdn.sqhk.co/vipotukivisi/gcgbqjj/65819992204.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/eybhhig/traffic_bike_rider_moto_rider_3d_unblocked.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/zagozufozeda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376120/normal_5fe1c87f83b8a.pdfIn PDF document text
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/7112289.pdfIn PDF document text
    • http://bererudi.22web.org/chamaram_movie_songs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomogaxelako.rf.gd/fojixaropoxejamim.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/92360588845.pdfIn PDF document text
    • http://najudugofuk.rf.gd/skoda_amundsen_manual_2014.pdfIn PDF document text
    • http://dipijiz.epizy.com/45070957815.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_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 5140 bytes
SHA-256: 04c773df31abe48335c5f07eb0a82c1ba66392e35d2a8b8ab02c95c1cf19f1f0
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 11144 bytes
SHA-256: 5d7458f4c4af65db4dff45c78d043b1806f17812bbf1e169556aa6a4592e70c8

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