Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8f27c9944c1ff3…

MALICIOUS

PDF

77.0 KB Created: 2021-02-21 04:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ba51c327210503289f70bd55ce38c51 SHA-1: 2f045a046ec547fc324afa42248af5ae48807179 SHA-256: 7c8f27c9944c1ff390b5173597509cb4d60f7545131d3cb94cc5e78723160b4d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic to direct users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://baarspo.ru/wb?keyword=lg%20tromm%20washer%20and%20dryer%20set PDF link annotation
    • https://cdn.sqhk.co/sewuvavimebi/qlOxiib/water_park_picnic_photo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_5fd8145001a8f.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/2gcXiJ0/battlefield_4_commander_download_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5ffbe51e6d5e6.pdfIn PDF document text
    • https://cdn.sqhk.co/tetaxekumipi/hbuWfja/suvifesedolew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5ff080e350a29.pdfIn PDF document text
    • https://cdn.sqhk.co/melukate/dhQghjg/are_hair_salons_open_in_los_angeles_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c6a1b411d5.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/G0gfhgQ/ninja_foodi_grill_recipes_chicken_thighs.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/arZjhic/51320862921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_602384573caed.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/gjohcjj/zerubomefuvigibedel.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/cf7c7d81208fd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_6029e09d1d9e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/jeJgZh5/weather_forecast_for_the_week.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/ninasivol/87167354185.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/gakesav.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/peweduviparavadavokafi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 2940 bytes
SHA-256: b1a9ff6ba35dc6afe0897100fc92f3f1f3234f8fbf85b49142f1f5db2d57e62f
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 5340 bytes
SHA-256: 0b49b70ee2919741fd3c3efaa32147d4036c3f40521d3a4712788ae095727712
font_02_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10428 bytes
SHA-256: db7616c3d4a42ad021a403a5a6a9df780a91a43551450384000980dc5dbac949

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