Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1d6e1a523eb039…

MALICIOUS

PDF

88.4 KB Created: 2021-03-17 17:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c6a685b75b4018916d0366c1977a76c6 SHA-1: 0261f197d2f3fd386086a1fcc974b00563b8db2b SHA-256: cb1d6e1a523eb03913e3def792943326b05419a36b0d991fa029dc3b6540eb4d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or to host further malicious content. The presence of numerous external URIs and the link farm heuristic point towards an attempt to manipulate search engine results or distribute malware indirectly.

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://nipisod.ru/wix?keyword=art+in+theory+1900+to+2000+pdf PDF link annotation
    • https://cdn.sqhk.co/vupapevixu/6hdfeid/merge_cube_2048_3d_merge_cube_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ILhftjh/48038314555.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/nemitoxabesajojopelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_604b1e78808fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5ff094a6572aa.pdfIn PDF document text
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/9685049.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/fShfiiN/baby_skins_for_minecraft_pe.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/rutefigew.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/miguel_serrano_quotes.pdfIn PDF document text
    • https://likomajuf.weebly.com/uploads/1/3/5/3/135321460/fivutu-xamoteponidi-ruxikubofogibib-vatof.pdfIn PDF document text
    • https://pudakelujoroju.weebly.com/uploads/1/3/0/7/130739680/zumifozi-gakitozepowijek-getabiz-nuwukiwexikakan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486522/normal_5fe0e1e62a25d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_6014c546a4357.pdfIn PDF document text
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/wagakewifeku_bizik_gegivapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/149b3602-268d-4f6e-90f1-fe04005f661b/what_are_you_quiz_buzzfeed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab77ba7-8906-4fa2-894a-28808d1ce094/33931234433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeaefd55-fb62-466b-a337-823d7741f425/poulan_pro_5020_replacement_bar_and_chain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f361795b-fedf-4a0d-a481-8e5d8ac3f580/how_to_fix_the_aux_jack_in_xbox_one_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febcb939-3655-422d-b019-7a00f1037438/83957511522.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_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 5284 bytes
SHA-256: 2cc404d59f45471d25889ba19fe08d36cc86395ef810d977b021adfbb4dd1753
font_01_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 12628 bytes
SHA-256: 148a8b0d6aa404b6892032c0f2903853a10c9f429c3786a38a1cf49062bec3ba