Malicious PDF — malware analysis report

Static analysis result for SHA-256 befd1990de77308e…

MALICIOUS

PDF

86.9 KB Created: 2021-03-27 16:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4cc9971cebb1dd099d10981bca5f8bd5 SHA-1: 52f51914765a2034d84d1aab9d9812365b1ad2a6 SHA-256: befd1990de77308ecd96eb9354a56f4fa3fcac7194f4712b812229d6524a4aa6
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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/award?keyword=9th+class+chemistry+notes+pdf+in+urdu PDF link annotation
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/pugovowisukofo-tidubojano-gosibur.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/Lbhfjcj/brawls_of_steel_apk_obb_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/hbMsRgd/australian_survivor_island_location.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/jc7jgnV/bike_mayhem_mountain_racing_paid_apk.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/jikibofajo.pdfIn PDF document text
    • https://dodafawo.weebly.com/uploads/1/3/4/6/134698388/745800cfa72.pdfIn PDF document text
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/kedifule-pewiwajinedona.pdfIn PDF document text
    • https://cdn.sqhk.co/wasefago/gZ9XIrI/94483278680.pdfIn PDF document text
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/d1b066230970fa.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/bdfbf0735.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/6uNidPF/knife_block_with_knives_john_lewis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/87883523354.pdfIn PDF document text
    • http://xidaruk.rf.gd/ano_ang_panitikan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4963ddc2-7256-488e-a373-5d2e67974347/get_the_guy_book.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/89713663939.pdfIn PDF document text
    • http://wovutemikinodow.rf.gd/34056021961.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/good_architecture_portfolio_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/71274500769.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/crappie_fishing_report_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63fb3e65-996f-4888-9672-7fe84ef06cf1/uniden_6.0_phone_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/angular_4_form_cancel_button.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/zalawuzeke.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5556 bytes
SHA-256: 3ca27d6169dbf99bf3ccab19a73517d548e2000a58251bf22b4cdfb6426d9299
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 11140 bytes
SHA-256: 7f30e37997c2de2de4fd1f4d91ebfe044cd85b05484a16356061cb4437113498
font_02_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 22012 bytes
SHA-256: b7e1d664a8342cb58b3e94ef28d8f9da0930511242dbaa42fa72d1871584115a