Malicious PDF — malware analysis report

Static analysis result for SHA-256 491236b8bd0cbd05…

MALICIOUS

PDF

86.0 KB Created: 2021-03-19 14:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2316bb866b0ae1a3d84b8f04dcb45de5 SHA-1: 718d94b7266a8ba9a3d944ba39acbbf8b406edba SHA-256: 491236b8bd0cbd05505ca207c1d6c6ad5834a4ced0095d50ec671800e7e660c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to potentially malicious domains like vilenefex.ru, suggests an attempt to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/wix?keyword=onkyo+c-7030+dac
    • https://cdn.sqhk.co/sabumijobude/ebjijhP/nakisalonemome.pdf
    • http://tobafiga.medianewsonline.com/business_intelligence_lecture_notes.pdf
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fd67426cd174.pdf
    • http://vumonivaxozutod.mypressonline.com/dunkin_donuts_blueberry_donut_holes_calories.pdf
    • http://jubigale.scienceontheweb.net/cours_d_orthographe_ce1.pdf
    • https://cdn.sqhk.co/mibazudifij/Fijhdgi/ric_freeman_tyler_tx.pdf
    • http://zumewidife.mygamesonline.org/wufawinedonijenijosuzaxuv.pdf
    • https://cdn.sqhk.co/gabadifofibo/6FjahbS/bejavif.pdf
    • https://cdn-cms.f-static.net/uploads/4407576/normal_604f14839d004.pdf
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/bemijivabemerewev.pdf
    • http://kunozoxutokusu.mygamesonline.org/ingenuity_baby_swing_problems.pdf
    • https://cdn-cms.f-static.net/uploads/4467322/normal_5fdc025cccd34.pdf
    • https://cdn-cms.f-static.net/uploads/4415745/normal_603021fc76068.pdf
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/nurelojadekas.pdf
    • http://juwupexutaval.mywebcommunity.org/kejasesikivujetiv.pdf
    • https://cdn-cms.f-static.net/uploads/4480878/normal_602b6f22f3374.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rebesudanolo/vlookup_to_populate_data_from_another_sheet.pdf
    • https://s3.amazonaws.com/sakaburepagase/cnn_reporters_salary.pdf
    • http://xipanizi.myartsonline.com/wuvidum.pdf
    • https://s3.amazonaws.com/lokijuronig/bansuri_ringtone_best.pdf
    • http://nanaxidimidi.atwebpages.com/proform_505_cst_treadmill_assembly_instructions.pdf
    • https://s3.amazonaws.com/zagapaxa/24712439035.pdf
    • https://s3.amazonaws.com/zijivevip/jakoka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2b.bin
3be171f85ad8f1702deb1f4d94cdea91689bb44ac529ffc8275d9ea726f877ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 1684 bytes
font_01_sfnt_off0001037d.bin
3e67cb9ab1e16ee1a84caec0782fe58392043fbbc3e4127ec6342efca1adf828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 5236 bytes
font_02_sfnt_off0001157d.bin
dc990ae205ed789176336ab2a32718c0f7c70cf36ef1a6d50034e6a683fbdec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157D 22880 bytes

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