Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7d2660ccde5b65…

MALICIOUS

PDF

72.6 KB Created: 2021-02-16 09:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 01fd48f8b853343512b6fb7d30b9b421 SHA-1: ead9d1775d6077245a3c8839f7d6c8d8893f44b2 SHA-256: 7f7d2660ccde5b6599db7c5c214ed343a1f755b99dcce5163f05cc28bd34cd71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, with a notable heuristic indicating it's a link farm on disposable hosting, pointing towards a phishing or malware distribution attempt. The document body, though partially garbled, contains references to 'Lenovo yoga 500 i3 ram upgrade' and 'wkhtmltopdf', suggesting a lure to download potentially malicious software disguised as an upgrade or related utility.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=lenovo+yoga+500+i3+ram+upgrade PDF link annotation
    • http://jexafagod.22web.org/70473662536.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/ginaparered-fedoji-dekoditonaza.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/5217c62ee.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/f16a4841eb.pdfIn PDF document text
    • https://liwotagavujid.weebly.com/uploads/1/3/5/9/135961529/372472.pdfIn PDF document text
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/9b8c35a7a56ec80.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/571132.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/xaxolaboxeto.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/rokuwapesu/microsoft_sql_server_2014_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/87916147807.pdfIn PDF document text
    • http://mepaduk.rf.gd/beoutq_mondiale_2018_apk.pdfIn PDF document text
    • http://tisajepi.epizy.com/bagogujido.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/lujifogozefaxatir.pdfIn PDF document text
    • http://mikusadetov.rf.gd/94121034405.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/sad_breakup_video_status.pdfIn PDF document text
    • http://ledonapagemes.epizy.com/teaching_clothes_esl_worksheets.pdfIn PDF document text
    • http://pobiludorigogok.epizy.com/english_guide_for_class_9_kpk.pdfIn PDF document text
    • http://nunitew.rf.gd/72321712820.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 5600 bytes
SHA-256: cc281846a55eb1566e16b1b8cc826f2f962f9dbaae9b7b1d06b7f9e810d76d15
font_01_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 12320 bytes
SHA-256: 96d709ec3343650d7cde6ad6dddfdcee3805a2a7e9ba53a81f122d2799529d2b

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