Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d209c3d00a3141…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 06:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b8528a0b0490e6c3d54420605ad1aa4 SHA-1: 523aee3567ca0193c0b44dea86a99012cabb2ca2 SHA-256: d3d209c3d00a31416b3031c371881f6d67e6eaec3679460935277922fa1ce405
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO link farms to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/123?utm_term=mars+rover+facts+and+information
    • http://titanof-filtr.ru/76823570960gc4cm.pdf
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/149d28c9.pdf
    • https://cdn-cms.f-static.net/uploads/4365636/normal_601a3e1dccac9.pdf
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/bdacda.pdf
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/fokilutixapis.pdf
    • http://dnepr24.info/449613065484724h.pdf
    • https://cdn-cms.f-static.net/uploads/4492555/normal_600c39e60f020.pdf
    • https://cdn-cms.f-static.net/uploads/4481402/normal_6047976260a76.pdf
    • https://cdn-cms.f-static.net/uploads/4448539/normal_602709c62efdb.pdf
    • http://fruits-summer.fun/70845124209dakjc.pdf
    • http://uscreditmonitoring.info/kingdom_hearts_final_mix_official_strategy_guidepx67f.pdf
    • https://fizabawizusor.weebly.com/uploads/1/3/4/0/134000364/1302136.pdf
    • http://shoplus.info/razowitev7qtfr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fofeguj/ipad_pathfinder_character_sheet_app.pdf
    • https://s3.amazonaws.com/takurugilij/video_helper_companion_app.pdf
    • https://s3.amazonaws.com/paxuvagal/coronary_artery_disease_treatment_guidelines_2016.pdf
    • https://s3.amazonaws.com/rejiner/tektronix_4000_series_oscilloscopes_programmer_manual.pdf
    • https://s3.amazonaws.com/zuponefi/xoduvujozebojarajuzimatog.pdf
    • https://s3.amazonaws.com/suzujewa/70142830406.pdf
    • https://s3.amazonaws.com/ladojenefe/fomekowukedobigosijas.pdf
    • https://s3.amazonaws.com/kelukakeb/what_if_netflix_series_season_2.pdf
    • https://s3.amazonaws.com/webipejonavuv/94637301922.pdf
    • https://s3.amazonaws.com/kobivimelelo/regugefenipinituvo.pdf
    • 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_off0000e996.bin
144f9884f2c6f42991433a232a54c6f8a64e1e302448dc8e64fa87cfaba47e2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5200 bytes
font_01_sfnt_off0000fb43.bin
804c08b1392ca4b741a85b21872b9cf58f953aa1000057716a17e5f9b3a3b235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 11252 bytes

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