Malicious PDF — malware analysis report

Static analysis result for SHA-256 966d41cefba73ec1…

MALICIOUS

PDF

81.3 KB Created: 2021-02-12 20:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 40a7cf001382fcf804007b9019b7d560 SHA-1: f1bd850eb460d4be336cb7737bb15223ee88355b SHA-256: 966d41cefba73ec170324f22ef7d9546f17f27c38165db887475cd97980817d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The document body, though heavily corrupted, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://bologen.ru/123?utm_term=alpine+cda+105+owner%2527s+manual PDF link annotation
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/3944044.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/pikesubejujavojisixa.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/472451.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/9cfadae2adb42df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuxikujare.epizy.com/algonkian_boat_building_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/beginner_english_assessment_test.pdfIn PDF document text
    • http://torexogisodejez.epizy.com/meteo_casinalbo_di_formigine.pdfIn PDF document text
    • http://kutezowifemiwe.epizy.com/raduvusow.pdfIn PDF document text
    • http://godidab.epizy.com/infectious_colitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/82967440834.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/shakira_hips_don_t_lie_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/befub.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/suxusakatawubibozobapeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/mathematics_questions_and_answers_for_grade_12.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/st_augustine_institute_formed.pdfIn PDF document text
    • http://diwukimip.epizy.com/gupazisolotakirumevamef.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/color_accent_editor_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/data_analytics_platform_enterprise.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_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 5652 bytes
SHA-256: 322c6a71f1d5b3cd1f18970c6c097866db5b12e40e197297f03ff5cd38dc31dc
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 11312 bytes
SHA-256: e9b449aeefa1ef8780b98090952283a6064e8e47c5e8c8089c59c4b31fedc448

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