Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a524c954590deb6…

MALICIOUS

PDF

74.6 KB Created: 2021-03-15 13:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c2981c3377aaa09929c1271719dea5a1 SHA-1: b4f4f7f8a927c73c6ce16fb2a3dca1e251236c8e SHA-256: 2a524c954590deb6ba075add7f62e35fa0159dba5b40b5535f090b64cc5cf958
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://vilenefex.ru/strik?utm_term=how+to+find+isoquant PDF link annotation
    • http://intereriia.com/772665243767k7xe.pdfIn PDF document text
    • http://construt.site/bovusadonurulijupojesrl2bp.pdfIn PDF document text
    • http://wedejopejujotu.iblogger.org/baixar_whatsapp_apk_gratis.pdfIn PDF document text
    • http://deemonatrafik.xyz/82853648592f0cjn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_60017f24e438d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_601cfaba8d2f6.pdfIn PDF document text
    • http://damvglaz0.xyz/gisipojiruwuzepeduvi3jkf4.pdfIn PDF document text
    • http://flowerport.market/25356771924ia5k.pdfIn PDF document text
    • http://nakrutkavk.site/timex_t78582_vs_t78587w9h3m.pdfIn PDF document text
    • http://net-klientov.ru/brother_serger_1034dx_tutorialm8g4m.pdfIn PDF document text
    • http://freud.icu/hideo_kojima_game_death_strandingnfs9y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_601c722ee3033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452385/normal_5ff71183bedf9.pdfIn PDF document text
    • http://libidisebosuv.22web.org/94752061738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_600a90512105a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejanubotikepiw.rf.gd/9293083946.pdfIn PDF document text
    • http://ganijofu.rf.gd/kerom.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_016912a49269475dbdbfd4522869aa7e.pdf?index=trueIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_0544b454be3d45f6a6ace9436d1aba76.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_df4e6eead04349e9b99f287c65d89577.pdf?index=trueIn PDF document text
    • http://dixadenidufudu.epizy.com/flannelette_bassinet_sheets_target.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_8539bfc65945454d994da8aebc4fc891.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 4952 bytes
SHA-256: aaf608f3167dbb4952740214ce72da853e80d902bead2d3aee7fe0f10c16e61c
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 11336 bytes
SHA-256: 9979485cf1f03173d56956c819025418255f37ff4b97981718a44d60482fc36c

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