Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5469ff706dbb09…

MALICIOUS

PDF

84.7 KB Created: 2021-04-05 08:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3cc5f4e28b116982efb4ed8256d7ce7b SHA-1: 1141eefaa5baebb8a8c19591390d331826d8d809 SHA-256: 6c5469ff706dbb091938fcd7b31f824b64cfbb042a408a01a448b0fa780ab881
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK'. These point to the URL https://baarspo.ru/award?keyword=andronovo+culture+pdf, which is likely used for phishing or to serve a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=andronovo+culture+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449788/normal_604c98bb51c86.pdfIn PDF document text
    • https://cdn.sqhk.co/fufowomusixi/j7jbuoI/capsaicin_pills_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6014c1ede8336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_606a3ac9bceec.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/SahenPJ/36818438675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fefa6678b977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462075/normal_5ff520bb037b7.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/g4hcgdC/insecure_direct_object_reference_prevention_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/gadadanilos/ijKjhhg/kalufexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_603122c9d005c.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/5f0cc2c2-d10e-4c67-b60f-c89600a23b8f/piluvurapamezop.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_565ff5ddd01f4a4da244360945bdbcb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bf5018-d2e1-4914-a496-af70d62833af/how_to_make_a_wellness_recovery_action_plan.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_b43b5d3909a0438d8549e90ffcd2be12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1252a4f-d9fb-482f-ae0e-f8fb2b5d3ccb/2971887061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee046e9-703e-4e8b-8521-06d7ffb6f0d2/32688457952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6bdeac-f7a1-4977-aabd-5b6fb9e891a6/how_often_to_service_volvo_xc90.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba26ac0-7724-4166-9cd4-49e263e7ae03/how_long_do_dr._scholls_insoles_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db3cb96-25be-4f5c-883d-ac1589644387/kenmore_washer_wont_drain_after_wash_cycle.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_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 4808 bytes
SHA-256: c4dec3de0e85ed89fdb7b1f79e6308505bc0c40f48edea3e3f7e3356fba1c734
font_01_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 10780 bytes
SHA-256: abdd6cdf60d917f69aee84f1109199f518df1a7d0480c3d8fb1deab64d8c7845

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