Malicious PDF — malware analysis report

Static analysis result for SHA-256 725bf4956e79ec6f…

MALICIOUS

PDF

71.9 KB Created: 2021-02-25 22:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0106d1ec82d7c53503a4df6cad850fb5 SHA-1: 21ea329abcd73ffbb2474bd8c6a6a229adb9a964 SHA-256: 725bf4956e79ec6fc075236f395d11350dc510aa19a6ced751e6d56d7c4f867d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://seumenha.ru/123?utm_term=how+to+do+f2l+beginners PDF link annotation
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/kamilikomuxofog-loxesuberel.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/fedututofoluji.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/55927.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/panurolin.pdfIn PDF document text
    • https://xugatasota.weebly.com/uploads/1/3/4/6/134673622/698b3a7e3670.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/tajowadogetafuvunil.pdfIn PDF document text
    • https://nupirunu.weebly.com/uploads/1/3/4/2/134265900/nobimatapide.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/a169b.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/julexekubaj/explosion_box_tutorial_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/video_recording_software_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/abs_plastic_sheet_lowes.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/32157784282.pdfIn PDF document text
    • http://telugave.epizy.com/36755669416.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/colorectal_cancer_treatment_guidelines_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/audio_bible_in_arabic_free.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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 5188 bytes
SHA-256: 6ed906890ecf329042802fba6bc4642aac8d0dd44f0c334f81d88e5d560351bb
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10620 bytes
SHA-256: 87b2e530ddcda0a0b1f877e91fef9d90a97f018a4fc3b5847f8c868a07e5ddc5

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