Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d901bf95790f1cd…

MALICIOUS

PDF

77.1 KB Created: 2021-04-29 20:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca75f8495ab26f10a98a5db9d5c440ca SHA-1: d08f1d9d2bc16ed95b0d15d2ca1ba89ca0c01607 SHA-256: 3d901bf95790f1cdb4e3ec8217b629b885a49f44f8cc96afa1b0cc29e0462511
156 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. The PDF contains a large number of external links, with one prominent link pointing to 'https://seumenha.ru/strik?utm_term=best+survival+movies+on+netflix+2018', suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=best+survival+movies+on+netflix+2018
    • https://cdn-cms.f-static.net/uploads/4375351/normal_6064e13a44cbf.pdf
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/525924.pdf
    • https://josuwolirekovu.weebly.com/uploads/1/3/4/3/134305593/28c837.pdf
    • https://static.s123-cdn-static.com/uploads/4454984/normal_6000cf0db2a2b.pdf
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/2073d.pdf
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5fdae7074abc9.pdf
    • https://rikejofexid.weebly.com/uploads/1/3/1/3/131381414/sekepar_wutavugow_magatodabonave.pdf
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/wulobigasuvupod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a01f0313-f680-4530-87a9-ce77a10bb621.filesusr.com/ugd/ac0554_ecab80d712404aaab9a5adb00783dcd7.pdf?index=true
    • http://rudowaxenesi.rf.gd/adding_fractions_unlike_denominators_worksheets_5th_grade.pdf
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_766aeb359f2943c3b80e7bfa7da9d4e9.pdf?index=true
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_b85fb38433b24f0dbc59996d9024d017.pdf?index=true
    • https://s3.amazonaws.com/musoxifuvitalo/writing_figures_in_words_worksheet.pdf
    • https://s3.amazonaws.com/fovezewi/free_calendar_template_2018_november.pdf
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_fd89e21f2fe6464dac04028195b082da.pdf?index=true
    • http://wateduwixe.epizy.com/gapugatomivaxotojaki.pdf
    • https://s3.amazonaws.com/geradi/26255189194.pdf
    • https://s3.amazonaws.com/zalomi/51850391566.pdf
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_fa71c39f93114eff8f09b4698965f2f1.pdf?index=true
    • https://s3.amazonaws.com/zoromexemuzid/mojeb.pdf
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_af202c7f5d624bdbbb6a6ea1ee63caf0.pdf?index=true
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_f81ac09d71ac404587394112027136cb.pdf?index=true
    • http://zefixufedinokas.epizy.com/algorithms_complexity_analysis.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_ad3cb87a100b4ed4a7cbf988be6e19c6.pdf?index=true
    • 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_off0000ee72.bin
cadd70f6832eadca8ccc7b8f9505522a3f5fcc189dbf01a66444fb7b6e063866		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 5612 bytes
font_01_sfnt_off00010180.bin
1441b8ef781c0c9bc8531d94e23337784d90cc9c306e294bdd4dd4accbd6d18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 10436 bytes

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