Malicious PDF — malware analysis report

Static analysis result for SHA-256 d117292d27ac90c1…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 21:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9a3457424c172514265cac693c538f8a SHA-1: 65e3be7aabd3d911573614a1eaef5fadff8e3de0 SHA-256: d117292d27ac90c1e5f001228377844709cf4a7eb1a97511e98e3d4b5c10e532
156 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 to benign resources, but one suspicious URL is present. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm for SEO manipulation or to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://jottigo.ru/award?keyword=celta+reading+lesson+plan+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491437/normal_601bcf4c1348a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6005bcde68142.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/4dc953a5-35f5-4cc8-a64c-6f05f48c8bf3/mogunaxavibisuxeru.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/maine_pyar_kiya_film_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/41105709797.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/brawl_stars_hack_app_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/17349069489.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/talk_to_me_in_korean_app_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/1492_conquest_of_paradise_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/google_doc_mail_merge_spreadsheet.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_bcba437c0c394ad6a15bb7055f9fca01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/bulumedot.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/call_of_cthulhu_doors_to_darkness_scenarios.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_4d65a6576f644273a2a3748f7a9def21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novifamigot/dewigepubuxejiwuninomepuf.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_d270d60950a44a3f889130fbc82e798d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/28058894671.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/heat_surge_adl-2000m-x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c3ccdb-9e36-4c69-bc56-ad2285405326/what_to_eat_to_lose_weight_meal_plan.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_bc601adca71a46c39070ab030b5cdc96.pdf?index=trueIn 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_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 5112 bytes
SHA-256: f6fc83b744321621363f340930c53491ced64bd817627316ca872585282f307a
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 10348 bytes
SHA-256: a64e4ffa5106d3f0ba23b0b866d6670951bb07b270c43f7fee9763111f4d5367

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