Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef016fefe140678…

MALICIOUS

PDF

80.1 KB Created: 2021-05-06 12:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2656d2894304c31489f51adc0a45c95c SHA-1: 75d5150254acc75dc294b717c376a4fc7d48e6b7 SHA-256: 7ef016fefe140678308ba4a0519dee81c6558882d81bd2e835c1b6ba94971bf3
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest an attempt to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=impressora+hp+officejet+4500+desktop+tem+wifi
    • https://cdn.sqhk.co/viwiratoposu/jgShfjX/71304638869.pdf
    • https://cdn-cms.f-static.net/uploads/4452839/normal_605faee544e83.pdf
    • https://cdn.sqhk.co/bunigenozav/sVxhfgi/49684003245.pdf
    • https://cdn.sqhk.co/susojareb/ggeu6T4/nwsl_expansion_draft_2020_predictions.pdf
    • https://static.s123-cdn-static.com/uploads/4459054/normal_5fc6b643cd4cf.pdf
    • https://static.s123-cdn-static.com/uploads/4378425/normal_5ff5c77941fa3.pdf
    • https://cdn.sqhk.co/gimexigerub/hjMjchS/amazon_music_app_crashing_2020.pdf
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/2618966.pdf
    • https://cdn-cms.f-static.net/uploads/4460048/normal_606c4b1001101.pdf
    • https://vixozomaregug.weebly.com/uploads/1/3/1/3/131398278/3912723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bitizopovopaso/urinary_tract_infection_pregnancy_rcog_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/2646cd53-f1e9-4657-ad3f-6445bd7d4793/fundamentals_of_drawing_english_edition.pdf
    • https://s3.amazonaws.com/zalisujezajaje/faditodozexemibo.pdf
    • https://uploads.strikinglycdn.com/files/a44594ce-c67b-46e0-9133-7831f12d4f10/giwowalegubamurusenufe.pdf
    • https://s3.amazonaws.com/nigimul/ellingham_diagram_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/78f8913a-0d8a-4d08-adc0-c8a06ee49302/sub_zero_fridge_repair_nyc.pdf
    • https://uploads.strikinglycdn.com/files/c01d0659-3eb9-4ec1-b96c-9c5ba09bb436/find_the_fourier_transform_of_e-ax_x.pdf
    • https://uploads.strikinglycdn.com/files/da24037c-bd6c-4cf5-aba0-8125ab8e5933/what_do_you_mean_by_plant_physiology.pdf
    • https://uploads.strikinglycdn.com/files/a2d9f445-1a29-4e06-8218-654e58516163/16812957954.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f514.bin
7d7b2500e9e0b1a28192e281942d2b3055e3fdcb72c4cd2e30cb54dd7c649312		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 5884 bytes
font_01_sfnt_off00010914.bin
c3ab988271f011b54a4d3f3fd1b46f9e058ac356d1eca28bd27d959dd497bdf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 13476 bytes

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