Malicious PDF — malware analysis report

Static analysis result for SHA-256 2528daa502dd9adf…

MALICIOUS

PDF

100.2 KB Created: 2021-03-20 09:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: daa5588ea20ab27768873e96d48f6a33 SHA-1: e5cd0ab67bad93d8199578f84cc85e3b924b45a8 SHA-256: 2528daa502dd9adfc2976d74668da46283e9be08fb88aa190725f7915f6f67e9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or to distribute malicious content. The primary malicious URL identified is https://bologen.ru/123?utm_term=apache+cassandra+administrator%2527+s+cookbook+pdf, which is likely used to redirect users to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/123?utm_term=apache+cassandra+administrator%2527+s+cookbook+pdf PDF link annotation
    • https://lafevisok.weebly.com/uploads/1/3/2/6/132683062/jegiwuwijofewu.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/gomutapijesovud-sagarogorokiz.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/losesikuvav_jijukelizunaso_somab_zuvijoxuze.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/8305406.pdfIn PDF document text
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/jokazoziriwixewap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6b58772e-470c-4c20-82f9-542cc948491b/33084457784.pdfIn PDF document text
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_b9f4055abb7440e8b46ad746539eb323.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_9f5c596207d64bbda5d56cd35fd70314.pdf?index=trueIn PDF document text
    • https://8de17e8c-b43d-4143-985d-773a0aa332b1.filesusr.com/ugd/01f6ad_a8ba8e04b6b04ad88058b947fd445223.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/shark_navigator_lift-away_deluxe_nv360_upright_vacuum_parts.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_9c3c7bb721184e21aec8fa8ae5544024.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6682cf60-b7ca-49a0-94a3-673726c52e7c/28780120726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d19aa8c-2ced-4f96-9a1e-033b4278fcb3/wipiximurito.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_bcb34492759a45bfbac0f9fa05b15c84.pdf?index=trueIn PDF document text
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_ad07b3b663ba42c48ac7fd694133b4e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eaa9570-dee4-4e6e-aebf-29d439fc57d1/stihl_sh_86_c-e_27.2cc_petrol_leaf_blower_vacuum.pdfIn PDF document text
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_85611fe360e74d34ba9ce4a1774b1817.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_f8ce0869f783407a939ddf8206fd26ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/menofajenuxotififamewejur.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_ef230b1b0164462f9015fb1de5c05cef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/wupelaki.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/63570939017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 5380 bytes
SHA-256: c5de11b08156ed963aa3b1d04e343e9558c55e4ba7acd122a8dee489fb9acb89
font_01_sfnt_off00014acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACB 12308 bytes
SHA-256: 2deaa05e2f02feb891efa441f253f626ea0eaa12d1a6523abcdbf6203951d242
font_02_sfnt_off000174bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174BC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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