Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c4039fb70d9cfe…

MALICIOUS

PDF

79.6 KB Created: 2021-02-12 00:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 103c704b5ba535893bcf0a7687c37bb8 SHA-1: 2c35ccb4a592dd8bee9b0457bb0dca0802e71bbd SHA-256: 66c4039fb70d9cfedbadb175eceaee143bb3dd96aba7b07165a3108c31191c69
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic firings indicate it's a malicious redirector and a link farm, suggesting its primary purpose is to redirect users to potentially harmful content or phishing sites. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crophysi.ru/wb?keyword=wow%20enchanting%20guide%20battle%20for%20azeroth In PDF document text
    • https://cdn.sqhk.co/repipedifavi/shhSrjb/boy_games_free_online_car_games.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/DBEgee9/crack_coin_master_spin.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/jasidipel.pdfIn PDF document text
    • http://dubupatixekun.iblogger.org/dfa_authentication_form.pdfIn PDF document text
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/40623357bc.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/bovedor_gatefezorej_tuwije.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/fc747ed7a4.pdfIn PDF document text
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/666503.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/bigizipu.pdfIn PDF document text
    • http://sixawuragime.iblogger.org/deathblow_xenogears_guide.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/lapox.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/dpgd3ja/easy_cake_icing_ideas_at_home.pdfIn PDF document text
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/jobemasepo.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/jupeluresuvivipavur.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/bPpggfJ/twitter_search_operators_location.pdfIn PDF document text
    • https://cdn.sqhk.co/forokuxodel/jbRhfw0/77494160385.pdfIn PDF document text
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/jokarugov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 5400 bytes
SHA-256: 4f7e30433b2bc90d65b614bbe2e77862ce7ba90bf9d81df704185f26a03eaf9d
font_01_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 10732 bytes
SHA-256: e47c26114c79282e51855d8ebbd742fbf5f4305b4d7193c1e205e8924fc50502

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