Malicious PDF — malware analysis report

Static analysis result for SHA-256 0faf7e5f444cbae4…

MALICIOUS

PDF

69.8 KB Created: 2021-03-27 09:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75dacf0c72052479390b185eec70b2a0 SHA-1: 7b047c8e12aefad242eea7b2151f90cb2c24f511 SHA-256: 0faf7e5f444cbae4e12364dd1b6bc91b233e7393c8d708ce2277d6d64aad0586
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 of which are likely part of a link farm or phishing campaign, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=power+rangers+rpm+toy+guide
    • https://cdn-cms.f-static.net/uploads/4374002/normal_602d43d32e5de.pdf
    • http://wedipum.mygamesonline.org/thinking_fast_and_slow_audiobook.pdf
    • https://cdn-cms.f-static.net/uploads/4377663/normal_605d6eabca0b7.pdf
    • http://xadexawufomovi.sportsontheweb.net/berazikepef.pdf
    • http://wulixiv.sportsontheweb.net/adding_and_subtracting_decimals_word_problems_worksheet.pdf
    • https://jozisanolotodix.weebly.com/uploads/1/3/0/9/130969335/zosenuzavoj.pdf
    • https://static.s123-cdn-static.com/uploads/4427267/normal_6001a01a55e94.pdf
    • http://vakiduweg.mygamesonline.org/social_anxiety_disorder_test.pdf
    • http://bajoreto.sportsontheweb.net/vepopolofi.pdf
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/lipedagepa.pdf
    • http://xumugawejal.scienceontheweb.net/glossary_of_research_methodology_terms.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jasigobup.epizy.com/asset_management_value_chain.pdf
    • https://s3.amazonaws.com/dorulusof/back_to_the_future_1_480p.pdf
    • http://kesajebofiruzu.epizy.com/fapujuzed.pdf
    • https://s3.amazonaws.com/jirebonudur/smith_and_wesson_date_of_manufacture_by_serial_number.pdf
    • https://s3.amazonaws.com/dojivewobasuval/muji_bed_sheets_australia.pdf
    • https://s3.amazonaws.com/xonobijikivo/xelasoke.pdf
    • https://s3.amazonaws.com/febopa/gozebitirumivegulefuxanu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b6.bin
b79efacbd3028452d34c81656dcc3c6fe7f7465bc3aa952342ef309e986df635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 5324 bytes
font_01_sfnt_off0000d7c6.bin
79d9b2e07e1d9434f23d4126a74696b3cea83af597948e7faae440f6c4f9a8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 10188 bytes
font_02_sfnt_off0000faa2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 4324 bytes

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