Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bec645f0b00779…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 00:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 875ca6ad94ca5bb1a687b7fe4c9f5a32 SHA-1: ab99bab4a5a447193e4fa35411b7e8dc2106c092 SHA-256: e3bec645f0b0077916d9da37bf5b1506adad5c45d3d65f16980bb7b359eeffcf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://baarspo.ru/award?keyword=what+is+a+strategic+human+resource+management', is embedded within the document's content, indicating an attempt to direct users to a potentially malicious site. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=what+is+a+strategic+human+resource+management PDF link annotation
    • https://zuxovupogoxa.weebly.com/uploads/1/3/5/3/135386903/fijajakema.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/b0594a20e12884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_6009bd71c0f2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_6017108dcf013.pdfIn PDF document text
    • https://manukigobedor.weebly.com/uploads/1/3/4/4/134481395/pupobisaxavi.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/zupuvajamuz_sunones_luxanolaxupob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc6b6d1d629d.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/vidikaledina.pdfIn PDF document text
    • http://busumewum.22web.org/graph_the_parabola_yx-423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_603a80b3909d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_603485fb4af11.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/5730175.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/91546e765c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_601e508fc3fc0.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/tugabijenovili/xawipovolam.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/71310344285.pdfIn PDF document text
    • http://sarovagovoz.rf.gd/65318685008.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/con_te_partiro_sheet_music.pdfIn PDF document text
    • http://vujipopeb.rf.gd/what_are_the_top_100_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/biostatistical_analysis_4th_edition.pdfIn PDF document text
    • http://buwanizun.epizy.com/bibb_county_jail_inmate_information_system.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 5192 bytes
SHA-256: 55f496e9ab3c45f96bbc4ffe94350b726001d1933aaa81117d4d18518d74e0c2
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 10652 bytes
SHA-256: 95408353dd99425e82fc97a191a8b85177eed34762d486c3f36ab9b87a13d8bb

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