Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b69b24073fbe38…

MALICIOUS

PDF

140.5 KB Created: 2021-03-02 19:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ceb7bddf18adf3e4b7e0653558e276c6 SHA-1: 2092f993dad276b3b79f4453c858b4d99bc8aaf3 SHA-256: e6b69b24073fbe3858f93d37e1ab7c4242a390c40d1a73cd24d282bbbc3e19f0
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=when+is+a+series+of+unfortunate+events+season+4+coming+out', likely serve as lures or redirect to malicious content. The document's structure and the presence of numerous external links suggest it is designed to manipulate search engine results or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/strik?utm_term=when+is+a+series+of+unfortunate+events+season+4+coming+out PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493266/normal_602e9817f1d42.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/nopotafatox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd3a7f3b155f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_60272714a7e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_603ca82d4efe7.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/riiLjhT/45532032502.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/nugotisevabeb-zevulipuzor.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/jaxonekef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420238/normal_5ffb440ce83d9.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/72241384553.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/how_to_complete_chores_on_vivofit_jr_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/hhjmAii/clan_of_dragons_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogujigasad.onlinewebshop.net/49576210857.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/zedejilojasefajaladi.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/dhhs_hiv_oi_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/64945874135.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/vafepobipodove.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_off0001e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9B1 5424 bytes
SHA-256: be515f2003f406779f0ad118c5974388b49ea5577d9ef238a3fe94a29e9c401b
font_01_sfnt_off0001fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC12 11868 bytes
SHA-256: 7d24755695565d60da278b6324913af7729bc5f2d30d29e72788b61737b5b433

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