Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6f5fc0df8531d5…

MALICIOUS

PDF

62.4 KB Created: 2020-12-06 11:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4a50e6b89fa6f02891789697d4a122e0 SHA-1: 71d8d1e02d5adae806b67b6751e1370567c8c3d4 SHA-256: da6f5fc0df8531d55f06392a9f3bd764a8cf2fe539fc5f1ebb6fcfe3b53a1522
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?utm_term=bob+pati%25C3%25B1o+fotos In PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/1ed625e0d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414172/normal_5fcc65d0d4ba7.pdfIn PDF document text
    • https://xiletepegokif.weebly.com/uploads/1/3/4/3/134319576/f3cd837a.pdfIn PDF document text
    • https://vajemedodumuni.weebly.com/uploads/1/3/4/3/134351385/gekefal.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/wixukugonuna.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/sufev-dewixov.pdfIn PDF document text
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/138202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_5faf4844960db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0dbd145a8629dc78247b/1606290880018/privity_of_contract_refers_to.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3805b3dfdd95b60e588d7/t/5fcc804533187724c4eaf826/1607237701832/hamster_lifespan_syrian.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33b91b8467722f1e32cd3/t/5fcaf49b21c0486e918ba267/1607136412058/zilakulodike.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf9b618e72e5fdb9caef7/1606285752043/rizulufoxitagafutopugoxi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2d11173fb5383b6c21ea/1606298898192/merrimack_valley_middle_school_penacook_new_hampshire.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29fd4c14dfd36fefc97f1/t/5fc75df8788a962b7c2e1e5c/1606901256816/brothers_in_arms_3_apk_play_store.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc30d185bcb0228a2907835/t/5fcc85f374a40730fb931b9f/1607239156042/xijisumatevuridimi.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_off0000b8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F3 5168 bytes
SHA-256: 8252f072d970650eb6ceb720a16b7404b430cd4530d40eb20bbbb7ccb38c179e
font_01_sfnt_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 10288 bytes
SHA-256: 0072f76d57ee770bf75aa65a65aebd6d693e0db0373dbd9e25d7afdbc8387598

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