Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad07f57aee80065f…

MALICIOUS

PDF

69.8 KB Created: 2021-03-12 00:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 569bd93ee6b72cddc1a425ec637a4418 SHA-1: a3c38f259585db9fa1aec2f11b54881de8eeec06 SHA-256: ad07f57aee80065f46c90070992e641501a82bb6c8ea6fde8c91b861c46ee3ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. The document body, though heavily obfuscated, contains keywords related to 'A level mathematics edexcel pdf', suggesting a lure. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely for phishing or distributing further malicious content via the embedded URLs.

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://xajibur.ru/award?keyword=a+level+mathematics+edexcel+pdf PDF link annotation
    • http://sevowina.medianewsonline.com/korg_kaossilator_pro_manual_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/saboretiki/xibYjfg/80_million_toman_to_usd.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/fibowaj.pdfIn PDF document text
    • https://cdn.sqhk.co/rawuredilu/hiBnwhg/digimon_adventure_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/ajfmcUj/kexuvezufamuninedepabizep.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/tiketu.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/photoshop_brushes_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_60afee01a3e84e809debed6435b0c67f.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_ab6e6191233f48c283060c7aef9cfde3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/10128622722.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_b768bfa4216645b88df4fb45f4a835f9.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_a270380738c64478829e3ad9df1deb4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/guvizesuxepatu.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/9990473346.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/bendigo_health_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/anthem_blue_cross_medicare_advantage_provider_manual.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_de687820e9924a2dbb9f030f69b19dd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/xoxugiwod.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/27346400226.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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 5416 bytes
SHA-256: 498d9deada3df8fa4569b52bbd93cfd25fed4038da74099a4724801988115559
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10452 bytes
SHA-256: 14d450d6e581f0b46c0b965b46c9ea09985f5178748c3abcb84dab4f68d18161

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