Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6524af0b2b72f3d…

MALICIOUS

PDF

97.6 KB Created: 2021-05-14 06:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d1f9392a046e1f0b29a97f0c034e04c SHA-1: eaf52858470c9b62110ad4cb8df74bbda13713d9 SHA-256: e6524af0b2b72f3de68f5f3c398e84d4944c1204ad4839d279e4eab553532b6a
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier, with critical heuristics indicating it's part of a link farm and a password-protected archive lure. The embedded URL points to a suspicious domain, suggesting a phishing or scam attempt. The document's content, though heavily obfuscated, appears to be a lure for the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/strik?utm_term=el+libro+de+los+muertos+egipcio+pdf
    • https://cdn.sqhk.co/bomumuxa/6Lgd1cj/basketball_stars_2020_unblocked_games.pdf
    • https://cdn-cms.f-static.net/uploads/4501989/normal_605308d3a8cb3.pdf
    • https://cdn-cms.f-static.net/uploads/4449193/normal_5fd68682b5928.pdf
    • https://cdn.sqhk.co/sarunasol/iajeXmw/isticker_sticker_maker_for_whatsapp_stickers.pdf
    • http://wugipesirexoxof.mygamesonline.org/general_medicine_alagappan.pdf
    • http://texoraw.sportsontheweb.net/artritis_reumatoide_fisiopatologia.pdf
    • https://cdn-cms.f-static.net/uploads/4485436/normal_601297173bc8a.pdf
    • https://cdn-cms.f-static.net/uploads/4366408/normal_605f4ded1a3a2.pdf
    • https://cdn.sqhk.co/palugalanivo/jnwkcX2/sojuvapofaxakodisi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuzamada/star_trek_enterprise_cast_then_and_now.pdf
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_a6217e41594347b0b4e364bf708c6b81.pdf?index=true
    • https://s3.amazonaws.com/telasebisu/populadolonelolegulugima.pdf
    • https://s3.amazonaws.com/naxozelozude/tisaxufavopem.pdf
    • https://s3.amazonaws.com/zepifudoxapo/renal_drug_handbook_2019.pdf
    • https://s3.amazonaws.com/metakibeme/who_plays_neptunes_daughter_in_spongebob.pdf
    • https://s3.amazonaws.com/golepe/south_movie_2019_comedy.pdf
    • https://s3.amazonaws.com/najipavez/sidinaxe.pdf
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_5b10aa5e75584bf8a2fd7869d87f63cb.pdf?index=true
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_8d56f1d8b8a8492a92045f7e49c802d5.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_6e9b5cf9e8ed4d26afedbca5dc126bf0.pdf?index=true
    • https://s3.amazonaws.com/tajimipojimo/34525431763.pdf
    • https://s3.amazonaws.com/vuliwisuwig/badujoruwakubexewosep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d33.bin
7f671544e7ede669e1d2b2daa69fa6ef72481510db9c5a414744e97dcae23547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 5364 bytes
font_01_sfnt_off00014f5d.bin
c855b47d59c54d54c98736136bd9c6f627ce46c70bf744e686e1a3474d6aa1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5D 12968 bytes

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