Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b15a338e566f1b1…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 15:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 38581793bcc1d36ef613957dffd48ea2 SHA-1: ec211a8ccc3c96c7b69aab6af38fa6b57e42dd43 SHA-256: 1b15a338e566f1b1abd2258288fb62354aeb56ca44faa5b1eac412a0e88f8c33
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to trick users into downloading malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the PDF_SEO_LINK_FARM heuristic point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=samsung+scx+4623f+driver+software+download PDF link annotation
    • http://navalny.design/how_to_replace_drum_on_brother_printer_dcp_l2540dwmd899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_6013bba6d35bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fd2eb5006e23.pdfIn PDF document text
    • http://vir-tus.com/donelipoziferenusifidilokgfsq2.pdfIn PDF document text
    • http://teagreen.space/can_you_work_at_ross_at_14uve3t.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/gh14GEF/beat_swiper_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_605fdd7d20a2e.pdfIn PDF document text
    • http://funseeds.site/parunawugokitareduwenotu5ut9w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_60170494380b7.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/gb5RCsW/bodav.pdfIn PDF document text
    • http://4d-5d.com/94937491513irnsk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_6051ee2e2c587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_20d3b9dc97b3410e996aa6937335c213.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_1cbb3b4b553943deb13ecbebc3af0895.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/xakasoriwepetefeferubud.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/lusuwonevezagugipukoguz.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/97782553579.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/14562328727.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_79801453e6524089ae0c6f468a7a665f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/whatsapp_video_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/41510536538.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/tuxilugakugavixoxifop.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_52d4f088eecf4a1b9c087da1ebce8f7f.pdf?index=trueIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_b88dc3ed0dd84170954831074c1f7370.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/75485201961.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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 6204 bytes
SHA-256: 03714204ca8c42a589a762fa825b8aed7af89dcff188b84505bc7e4eb7e75a2c
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 10764 bytes
SHA-256: 6ae765294e67e5e31f37773373933b4442fc194be97628b35b35f6500ae23cd7