Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6a91f0d22a871d…

MALICIOUS

PDF

72.2 KB Created: 2021-03-30 07:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79c6a2b52ffbda4cff2f47e1bc24da13 SHA-1: c96e70d389d935670274eb3f2fa9b2a5d69cf8d6 SHA-256: 1b6a91f0d22a871df5511b02ea54bed482454814aadcbe1cc2b37f0a0e2fec1a
204 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is part of a phishing or malware distribution scheme, specifically using SEO link farms and redirectors to lure users. The embedded URLs and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or a second-stage payload. No scripts were extracted, but the PDF structure and external links point to a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/award?keyword=dead+poets+society+book+pdf+download PDF link annotation
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/wezotutu.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/9384539.pdfIn PDF document text
    • https://ronogutelujevur.weebly.com/uploads/1/3/5/9/135956648/jizisowotukev-zivemi-kanij-ruwaxiriguku.pdfIn PDF document text
    • https://gudeworidive.weebly.com/uploads/1/3/4/7/134767917/7888759.pdfIn PDF document text
    • https://rigagebefizo.weebly.com/uploads/1/3/4/6/134631069/pitorotitoj.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/95a962d50.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/277df54.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/gilis-tidulu.pdfIn PDF document text
    • https://zifatajute.weebly.com/uploads/1/3/1/4/131438038/6788103.pdfIn PDF document text
    • https://bexokibuki.weebly.com/uploads/1/3/2/3/132302940/ragagewerubipetekan.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/darobagefe.pdfIn PDF document text
    • https://lewixixidofuj.weebly.com/uploads/1/3/4/3/134393564/1812965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_433c2dc7002c4f4abef689ae11f5aca5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/what_are_the_healthy_habits_during_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/the_critical_period_hypothesis_could_explain.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/adjectival_phrases_worksheet_grade_5.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_0f1de7d287b24d818a7eea2fe8013eb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/perimeter_of_a_right_triangle_worksheet.pdfIn PDF document text
    • https://e7c02ae7-ba66-49ef-8fe7-d4c265c54a1b.filesusr.com/ugd/bc5701_a34c56c406ee4ba8806694244bc0337d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/99489424965.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_ad041161a4174da295e3df8ed9403d6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotenu/nifisilorir.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/89887431746.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/motorcycle_diaries_plot_summary.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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 5448 bytes
SHA-256: adf3675e751ae43ebc014830a85ba1bd015a64ec1f8c8d11e84020895364fdff
font_01_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 10464 bytes
SHA-256: 1a777f2bc16e0e97bea53b270381901a78e6e2d05d506e7a4c80b542428a56bb