Malicious PDF — malware analysis report

Static analysis result for SHA-256 836e37b838f2163f…

MALICIOUS

PDF

59.7 KB Created: 2020-12-01 08:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 097a8689c3bba7ceabb75be5d75c5576 SHA-1: 1702e7b8b2aff662065624c0a7d9d219152f2856 SHA-256: 836e37b838f2163fa14dfcbe753156299b82d63d7ec658b9c17d86a47307c03a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/123?utm_term=present+simple+future+tense+exercises+pdf PDF link annotation
    • https://tovuwopisivid.weebly.com/uploads/1/3/4/6/134640328/xunowapena.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/8bb5a20a4c736.pdfIn PDF document text
    • https://menedusuwoguv.weebly.com/uploads/1/3/4/6/134699995/4654358.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/wifot-vizikig-mejebirag-doroma.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/vugivojelab-juwikaz-roxumujisewaj-suxumasiv.pdfIn PDF document text
    • https://tejebufu.weebly.com/uploads/1/3/4/3/134353082/mavoniguxizub.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/nedijowewoded/fiction_and_nonfiction_worksheets_4th_grade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf254eaf37e3b646102cd/1606283860695/finite_element_circus_virginia_tech.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/83983643279.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/atlassian_crucible_supported_platforms.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b9a71452f90b7ff10464/t/5fc5b007bc819f1cf49d490c/1606791186957/53263858817.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe18943485235c868d4e8e/1606293670526/yu_gi_oh_pro_2_apk_download.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_off0000af29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF29 5160 bytes
SHA-256: 630a362ce9feb5c4d3d8dcccc4aee6e8e6c580502c2a455263ab5e33e177e309
font_01_sfnt_off0000c0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A8 9780 bytes
SHA-256: 8a1c6ada411996ae7a2ff8bc6ce6f584a1b66e2b4a3364248120a3ad639c7cd6

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