Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00ec376e8b643a0…

MALICIOUS

PDF

89.5 KB Created: 2021-02-27 23:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 79ebdfd9491197260518f74c99f03b5e SHA-1: 2f187b7314002e385f71daac3436880aff2ba591 SHA-256: b00ec376e8b643a0dd07f7f067c0e26e29678db8c454781f10586af78add02e2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The heuristics reveal it contains a link farm with numerous external URIs, including one pointing to 'leonvi.ru'. The presence of multiple PDF links and the 'utm_term' parameter suggest a phishing or SEO manipulation scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

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://leonvi.ru/123?utm_term=how+long+has+bob+ross+been+dead PDF link annotation
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/5612478.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/fda2f.pdfIn PDF document text
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/waxor_lekalejolizeru_gujudubifuna.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/nunirasudiwo.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/35444614b1d8b.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/dedet.pdfIn PDF document text
    • http://nicepics.xyz/chordal_harmony_janek_gwizdalaqxq6q.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/8107679.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/present_perfect_simple_and_continuous_exercises_3_eso.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/zisulamisozoto/79718778065.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/lisuketajekagosexidosuze.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/place_value_worksheets_for_grade_5.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_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 5280 bytes
SHA-256: af2aa20c1ac73da3f2565986ac8fb5daf401b3b3937e9ce119c8182b39a2ede0
font_02_sfnt_off000131bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 11532 bytes
SHA-256: 14385139dfa38447edd826b7448c071e91c6393e3a1e5be79595bad34b52179b

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