Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3fec9b727080a9…

MALICIOUS

PDF

93.8 KB Created: 2021-03-26 09:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b34d88662589616bcd40b7102de33968 SHA-1: 3c4cf9fcf4404cb6f9c9d69a4aa886c459fbdec0 SHA-256: fa3fec9b727080a90788bb2244392f481146486177b8e36cdd0f3ad5bb07eb13
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to potentially harmful websites, 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://resalured.ru/award?keyword=fisiologia+del+pancreas+endocrino+pdf PDF link annotation
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/6db6af2.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/T90qigy/informer_song_1990.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/hdif2JT/51195121739.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/0a97045c33d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_602a429876333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd1521d56362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60159dfec242b.pdfIn PDF document text
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/wiwisexenerefix-xipasugij.pdfIn PDF document text
    • http://gejepixaso.iblogger.org/duwoniros.pdfIn PDF document text
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/vubajoki.pdfIn PDF document text
    • https://fawofasoz.weebly.com/uploads/1/3/1/4/131454040/pituz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevosana.rf.gd/bridge_over_troubled_water_sheet_music.pdfIn PDF document text
    • http://ragujaje.rf.gd/what_can_i_eat_instead_of_grains.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17bcc566-41f7-4fdf-982f-b50802460f91/who_rules_america_the_triumph_of_the_corporate_rich_7th_edition.pdfIn PDF document text
    • http://lanadofebanubod.epizy.com/free_bootstrap_templates_for_school_websites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32136fe0-7046-4666-b195-c41e5d8b3a9d/lg_lfx31925st_linear_compressor.pdfIn PDF document text
    • http://gonuwufif.epizy.com/zixidubajipigib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863807be-e389-4c6b-a803-fe6db366f041/21571832758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cce3161-91a8-4d40-a3e9-d8ca36228cdc/toxexavunijewimosajurew.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_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 5276 bytes
SHA-256: 12f10dcf787378c47d99bc5be2126260bf84d0c14d09b86017f2138b15e4526b
font_01_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 12368 bytes
SHA-256: 38341f220eea134f8086ee24bbfda0d55836ad9aa2db5dffee18bfa166ff4890

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