Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e103a8a454758c2…

MALICIOUS

PDF

79.8 KB Created: 2021-05-30 06:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43d46d5e7190fb2289b9ca0a8a69f662 SHA-1: 7b17d4b7fc2124d90b9cadd16a8170081a0aac8e SHA-256: 7e103a8a454758c2199cd0b038d2fd90d4c915c971d4466b50a8873feeef255c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://seumenha.ru/strik?utm_term=corel+draw+x6+user+manual+pdf
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/2161889.pdf
    • https://static.s123-cdn-static.com/uploads/4488815/normal_6004aea322253.pdf
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/jedagogojibosim.pdf
    • https://lurabesuweki.weebly.com/uploads/1/3/4/5/134524451/sufilodofusuxat_sagibawuladose_xelenizigagol.pdf
    • https://vutitikanok.weebly.com/uploads/1/3/4/7/134774074/9883664.pdf
    • https://mulujalopopu.weebly.com/uploads/1/3/1/4/131407089/xuvigisulumoluzijup.pdf
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/8a783016.pdf
    • https://cdn-cms.f-static.net/uploads/4482402/normal_6067684c83534.pdf
    • https://molefagis.weebly.com/uploads/1/3/5/3/135311004/fozet.pdf
    • https://domovogi.weebly.com/uploads/1/3/4/7/134710089/5496390.pdf
    • https://cdn-cms.f-static.net/uploads/4445889/normal_604aece45354f.pdf
    • https://zidereromozuj.weebly.com/uploads/1/3/4/6/134602294/e56a9084.pdf
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/fdc3be75072b.pdf
    • https://cdn-cms.f-static.net/uploads/4454302/normal_605f9b50de880.pdf
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/kagojiwem.pdf
    • https://cdn-cms.f-static.net/uploads/4462035/normal_600b792ada66a.pdf
    • https://cdn-cms.f-static.net/uploads/4418391/normal_5fda8f870754e.pdf
    • https://static.s123-cdn-static.com/uploads/4369190/normal_6002010270535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e5ab6abb-2a60-45b3-b75f-5c735e8323ec/school_uniforms_are_a_good_idea_and_should_be_required.pdf
    • https://uploads.strikinglycdn.com/files/28ca247e-8da7-4867-b2dc-f708b448333b/5_senses_booklet_for_preschoolers.pdf
    • https://uploads.strikinglycdn.com/files/0a4c42c2-3738-4788-8e09-bbe54501d8f1/gituzubedizer.pdf
    • https://uploads.strikinglycdn.com/files/240441be-6766-4e61-ac2f-aec26533f481/gusosafoguvifo.pdf
    • https://uploads.strikinglycdn.com/files/262e4747-59e1-45ee-8a78-947ce904874d/foxconn_n15235_motherboard_audio_drivers_for_windows_7.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_off0000f75c.bin
b9e007f36fe54db6a0f6300b466b1f1c545c0433f40926ccccbc084679749803
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 5408 bytes
font_01_sfnt_off000109b8.bin
a6e39db39c20f1c95816178bef91a58dc60a0da630c5e131fd99d33de053213e
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 11648 bytes