Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0997e7c8fe5a67…

MALICIOUS

PDF

80.5 KB Created: 2021-03-25 05:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 3d53490f194e25e01595a999a42f9db7 SHA-1: 9402a4f79361d2bf24770e62d0eda53f4ac434d9 SHA-256: bb0997e7c8fe5a67a9dc061999ad7382c23d3a26c353cedf1560cca7e515733e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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
  • 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://leonvi.ru/strik?utm_term=how+to+assemble+dremel+4000 PDF link annotation
    • http://bumululoru.mywebcommunity.org/english_grammar_exercises_pre_intermediate.pdfIn PDF document text
    • https://gefimopawudomew.weebly.com/uploads/1/3/4/0/134017284/vegesoz_jiniladu_xilalar.pdfIn PDF document text
    • http://losmopaka.site/bijub3w3w5.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/vagowilizemositole.pdfIn PDF document text
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/1274568.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/33899896154.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/fegaditunugoz.pdfIn PDF document text
    • https://seperabe.weebly.com/uploads/1/3/4/7/134714478/5498846.pdfIn PDF document text
    • http://prolac.ru/hd_wallpapers_for_pc_1080p_freeyppgz.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/2bdc5ca.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/6186726.pdfIn PDF document text
    • https://lapobozitex.weebly.com/uploads/1/3/5/3/135305834/2197146.pdfIn PDF document text
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/gekaguwo-rusazopimakom-zujaxupulapeli.pdfIn PDF document text
    • https://ramosekizopozov.weebly.com/uploads/1/3/0/7/130740175/getabalule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotofuku.rf.gd/51724909551.pdfIn PDF document text
    • http://wenares.myartsonline.com/marketing_management_salary_in_south_africa.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/wuzepusazevabox.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/64856862389.pdfIn PDF document text
    • http://vuxotuketut.rf.gd/38346051272.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_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 5396 bytes
SHA-256: 503fa13d2e4c11d6141274b31bdff35192ae4d9a525dbb52a777f9d04389415f
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 10348 bytes
SHA-256: e5317b9084e8f381bb60ff93f937279a336e9043f76244659f8d40c20eb4534a

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