Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c8e2f4fd1bb1fc…

MALICIOUS

PDF

116.8 KB Created: 2021-03-20 01:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a18e060be71cc2762d3f82e29990ca3 SHA-1: b4e2c56006d20c03443c83716ba8d66c58449d85 SHA-256: 42c8e2f4fd1bb1fc9b5eaa05a28a28dc5d0d8fd87d753421a2785a532738e1e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme. The primary URL, https://seumenha.ru/wix?keyword=medela+manual+pump, appears to be a lure, likely directing users to malicious content or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=medela+manual+pump
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/monewejesavul_buzovapiwewoxe_nimuwivuvizirol.pdf
    • http://dupuladusudired.mypressonline.com/how_to_control_apple_tv_3rd_gen_without_remote.pdf
    • http://bufo.online/anaconda_python_3.7_download_for_windows_10_32-bit7bzb9.pdf
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/zozusudipokelik-bularubo.pdf
    • https://fupiloxeti.weebly.com/uploads/1/3/4/3/134380404/3088012.pdf
    • http://palikexifumalam.mywebcommunity.org/tutorial_autocad_2016_espaol.pdf
    • http://cocobeautybar.ca/388387801081xoj0.pdf
    • http://kedugobepuged.mywebcommunity.org/microsoft_brand_guidelines_2020.pdf
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/medoxide-xinekapuxek.pdf
    • http://gedatidigog.sportsontheweb.net/8947929162.pdf
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/bajurokerifavigimo.pdf
    • http://all-system7.club/tenijnywlj.pdf
    • http://g2am2e.xyz/balancing_chemical_equations_cheat_sheetwikqi.pdf
    • http://zespodsvetkoy.site/atheist_experience_podcastepdz4.pdf
    • https://sagetiruguw.weebly.com/uploads/1/3/0/8/130814856/aee6379e3ed6d04.pdf
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/861557.pdf
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/wuwotajerusomona.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/maninubejiv.pdf
    • https://belonimilulufaf.weebly.com/uploads/1/3/4/4/134403367/ffb4691a08d57.pdf
    • https://kaxuzuditad.weebly.com/uploads/1/3/5/3/135310968/luxidapujub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ca8ef2a-aa20-4862-82cd-ffd044fd6acf/65568993175.pdf
    • https://uploads.strikinglycdn.com/files/0a39b8a6-9648-4f87-a01f-b70d29921c34/mainstays_pc_desk_instructions.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_off00018916.bin
2ac0512615f61a32c034a4d696096427d69138b4852dd2c73017ef0a6ec15869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18916 4836 bytes
font_01_sfnt_off0001997e.bin
c22e2a7e366290d26c62163b5234851f1340294e219eba9825cde594d9565807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1997E 13324 bytes

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