Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af1b08999d0b93a…

MALICIOUS

PDF

70.1 KB Created: 2021-03-16 08:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3f1200a1c05bf53172f7ba4f11ff63 SHA-1: 630a977fda2bae08ce37c616312fbaea643511dc SHA-256: 4af1b08999d0b93a686dda4c567aa8365f174ea414b21097ed6c3b86ee7d64b7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL observed is 'https://druttle.ru/wix?keyword=2019+and+2020+broward+school+calendar+printable', which is likely a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://druttle.ru/wix?keyword=2019+and+2020+broward+school+calendar+printable
    • https://cdn.sqhk.co/zinoliwomi/raieVif/68281034870.pdf
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/8358761.pdf
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/wusivuzupen-xoxesizefaxijab-sajemodenibatu.pdf
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/fafegelutoti.pdf
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/xumikadewus.pdf
    • https://cdn.sqhk.co/tumupowe/aigeNja/nabupaxanuvefusodiz.pdf
    • https://zoluvurodozi.weebly.com/uploads/1/3/0/7/130776250/3847857.pdf
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/bf164.pdf
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/1056625.pdf
    • https://cdn.sqhk.co/toralapiluw/hihifjh/custom_maps_rocket_league_epic_games.pdf
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/b5d6cf92c.pdf
    • https://zozizifubigidoz.weebly.com/uploads/1/3/1/4/131409074/87a766d2f.pdf
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/nedefibosabogam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_f68f2c2a195645aaadbd45f589906702.pdf?index=true
    • https://s3.amazonaws.com/bolovopizonuki/jomiworefotaxovuxinotija.pdf
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_56212d3fd7954fc78376b7391cb62ffa.pdf?index=true
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_6f6745959d9e45c8ba2745c288632b2e.pdf?index=true
    • https://s3.amazonaws.com/fomudebipefasu/xazemalotaxomo.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_14573631a6cc4525828c7c30031ec195.pdf?index=true
    • https://s3.amazonaws.com/papuja/kubota_b2650_spec_sheet.pdf
    • https://s3.amazonaws.com/rodigapigeta/sudanomuborumiguvo.pdf
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_4b25eb2af9aa4b0ba4e26d04f8982914.pdf?index=true
    • 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_off0000d531.bin
c6a33ff0af737b2696ba4fbb7396bdf2235bf5f628d303f8144cb3de8af3f46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 5780 bytes
font_01_sfnt_off0000e8e3.bin
823c2d468fdfd989050e213efd4caf6b1f9c12cb3ff61e1f59f8fbddd766dab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 9916 bytes

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