Malicious PDF — malware analysis report

Static analysis result for SHA-256 597bb436a3087c9e…

MALICIOUS

PDF

82.9 KB Created: 2021-03-19 03:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a81175ed6f4d9c6f6df20f8663b2d76c SHA-1: 2a850120b1cbaa70afa36f7d69b896a4809c0fd6 SHA-256: 597bb436a3087c9e0f389b9e68bc3371783dff12c04d499e996d7391dcc48fb1
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links designed to appear as legitimate SEO-optimized content. One of the primary external URIs, 'https://mezovuduw.ru/wix?keyword=yo+te+busco+con+marcela+g%25C3%25A1ndara', is likely part of this lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/wix?keyword=yo+te+busco+con+marcela+g%25C3%25A1ndara PDF link annotation
    • http://relax35.ru/25827096580153yk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_6049a5b3a1108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5fd68b7fd5350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_60304fd25d3d7.pdfIn PDF document text
    • http://bloomwithdeanna.com/heartstrings_dolly_parton_songswd1me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_6049b68270f84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412607/normal_602e4a0a4ca75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_602034951a819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fcc02236f02a.pdfIn PDF document text
    • http://nigasheff.xyz/surupoztptf.pdfIn PDF document text
    • http://hardcreditcheck.info/genalex_kt66_datasheeti1awq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5fe9421de0d77.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/sedimeraxufi/media_clip_pro_video_er.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_5825b0c28d594d669679439b3fd58d1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/97736338095.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/atrial_septal_defect_pediatric.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/barasuara_full_album.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/daedalus_wallet_android.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/nuvarejosuxuxizoto.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_e2f301c8c4f54a7f8ae5571e9d8e80c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/instrumental_afro_beat.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/14349350277.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 5596 bytes
SHA-256: 1169c855bece439a28631cd341f4442884590124c5cbdd4c75ad61ee8bc5cb2f
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 10700 bytes
SHA-256: 002bb1ed030ff5aad216c5f9ac7b5ed100cbc141fbc4a3348817ac42d23dcf12
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 17840 bytes
SHA-256: 970e67d0e01229999f2c1b9639a93114443deeb5d4da3d9dbbfa4d5f5106651b

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