Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a6532ef54b2464…

MALICIOUS

PDF

85.3 KB Created: 2021-02-24 03:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ea3a88cef14c73c07a9c018e81eac81 SHA-1: 18f6c1f0e981973f36b08075a705eeb60521b9d3 SHA-256: 74a6532ef54b24648bea1ffd2401363a13eb89e7b9bc359c058ef89852ef33cb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, suggesting a link farm or SEO manipulation tactic to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to be a worksheet, likely a lure to disguise the malicious intent of redirecting users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=parallelograms+rectangles+rhombi+and+squares+worksheet PDF link annotation
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/sikebotuvipegubofi.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/wemob.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/xibin.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/jobubabozator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_5fd999856fbc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fc9f72e938cb.pdfIn PDF document text
    • https://gimimelaxagoke.weebly.com/uploads/1/3/2/7/132740951/lobodozevisoludubig.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/detokun-werujudov.pdfIn PDF document text
    • https://lilalosemojuwo.weebly.com/uploads/1/3/0/8/130814601/3922300.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/hKhhJXV/zifumazofitafimi.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/moniwuxagukozen-nixinufodulewi.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/igsKLij/restaurant_story_appliances_recipes.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/dowavelaxam/us_fda_bacteriological_analytical_manual_bam.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/iphone_app_store_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/streaming_radio_iphone_app_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/kuwubu.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_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 5776 bytes
SHA-256: 453c639a53c021a8a2183511245fbc80c0c8695da1708b5c9c3d2865becb93b7
font_01_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 10908 bytes
SHA-256: 7fb74a878d697faf7f16bb4e342fc3562208ad9d13d2661264baf2ba3f5b5946

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