Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbbcc1e7b224cee…

MALICIOUS

PDF

76.7 KB Created: 2020-12-27 20:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e8547718193ac9482370b65e7a1f69a4 SHA-1: 1f1decaa00efedb0452ec9547f5d364387fd5169 SHA-256: 2bbbcc1e7b224cee6be30637f0a94bc2635739c25a5d7a44f5f6f7400aeee65a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic to various external resources. Critical heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=area+irregular+shapes+worksheet In PDF document text
    • https://cdn.sqhk.co/wemegofuk/c1zihjd/legendary_weapons_guild_wars_2.pdfIn PDF document text
    • https://cdn.sqhk.co/murevexi/bgiieJr/wikipedia_warcraft_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_5fd92f59b9a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5fb5b852955e6.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/9315313.pdfIn PDF document text
    • https://mozabedo.weebly.com/uploads/1/3/5/3/135323929/1547516.pdfIn PDF document text
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/meromorev_fujikufanolabik_mobizedigoro_zijusanijekador.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/nolaforiwipu-sitogubumivunuf-molov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f8b6656991f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f8ff262d813a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5f8d61c523583.pdfIn PDF document text
    • https://fiwimojulo.weebly.com/uploads/1/3/4/5/134525916/gowetinoreditezeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f920229988c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d11657e0-36d0-4fa5-88ca-29117abe9a7f/63498843761.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/aparajita_singh_ias_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/cv_latex_template_phd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 5000 bytes
SHA-256: b78e735690d024185e887d5140d7dbf4a319ace57e05c4db37e2016d07e3248f
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 11576 bytes
SHA-256: e5a32279c7985e29399f536b8ff54c3ecf2e6712e4ce608153defa2d43fa0481
font_02_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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