Malicious PDF — malware analysis report

Static analysis result for SHA-256 5315960f128fe2e6…

MALICIOUS

PDF

77.8 KB Created: 2020-12-28 20:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bea7b302d908ecccba82dd62afbbfb67 SHA-1: de29844df07f1492db75eba95fa7b1f1819aac43 SHA-256: 5315960f128fe2e60aa4217ef4cb53b5de87772f92f8f552a684a0882f2cceb0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though partially obfuscated, references 'Gramercy arts high school dress code', indicating a potential lure for phishing or malicious redirection.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=gramercy+arts+high+school+dress+code PDF link annotation
    • https://cdn.sqhk.co/zijikunu/g39ibfI/31525848524.pdfIn PDF document text
    • https://rawixokuboja.weebly.com/uploads/1/3/4/0/134097397/5484623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5fa7039a32d0f.pdfIn PDF document text
    • https://vasiwamalag.weebly.com/uploads/1/3/4/0/134012587/tifuposif-vawif.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/eicggG4/flixster_redeem_uv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5fdb6f90e4011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_5fc254983a51b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5fafec282a9ad.pdfIn PDF document text
    • https://rezomiwutamanap.weebly.com/uploads/1/3/4/3/134362688/7bbcadaf.pdfIn PDF document text
    • https://tuluseso.weebly.com/uploads/1/3/4/7/134718642/b764b17e3a0.pdfIn PDF document text
    • https://gupesasuxubigu.weebly.com/uploads/1/3/4/7/134717911/1067015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goviwigax/cute_girly_wallpaper_hd_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/jzyk_angielski_gramatyka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c284aa-af5c-4d6d-962e-43ab30215558/bosizinimokuvodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f620f89a-99c5-4372-896f-add5e0c1e9b6/project_management_books_2019.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_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 5488 bytes
SHA-256: 9c668c3f535e99cd98c8cbc37af4c379ff071266d16876816b3fcbea5296fde7
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10684 bytes
SHA-256: 28b57464eef9237f302b0d34a542b8d49ceedd49b4e1127d5cf807b7e4092e38

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