Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bb09c51d7fa638…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 10:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fcffcd5206fe3c60ff74d52c508c6b16 SHA-1: fe59b9fcc5047bc981c03c88ce116bda1d1c692f SHA-256: 19bb09c51d7fa6389029bb0d568b282b4621bd5f2c9cc2b569e4ff04486161b6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/wix?keyword=how+personal+computers+changed+the+world PDF link annotation
    • http://tisimewifexumi.iblogger.org/12311687399.pdfIn PDF document text
    • http://naturalm.space/apologetica_evangelica1hjq3.pdfIn PDF document text
    • http://bestcreditcheck.info/mixenedobizirurwxrf.pdfIn PDF document text
    • http://kleomaften.online/bubidolibepaxotibidowa78zmx.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/b804cd.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/87661661584w8xzu.pdfIn PDF document text
    • http://pet-guru.shop/77388921261xj4uc.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/dde0ab31f032.pdfIn PDF document text
    • http://qwonder.space/vinulesogoxeyuo99.pdfIn PDF document text
    • https://paxowamowutujaf.weebly.com/uploads/1/3/4/3/134322095/lofesiv.pdfIn PDF document text
    • http://baltika-trans.ru/20559302912bn6c1.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/febaxijeno_fejolive.pdfIn PDF document text
    • http://jakartapro.xyz/what_is_the_purpose_of_general_systems_theory825ot.pdfIn PDF document text
    • http://badgesverified.com/zigirudibuwadumurenc5l8m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_8f6642e8b61f476199bcf705412ee659.pdf?index=trueIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_25ad4bff15bf4e10b939bbed48a5e06d.pdf?index=trueIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_31477a9449d1469980c2196b1d44e82c.pdf?index=trueIn PDF document text
    • http://nedajazamofo.epizy.com/60703152148.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_08be3d1ac4ca416bb89443819ca9ee84.pdf?index=trueIn PDF document text
    • http://vipukexevuwe.epizy.com/meaning_of_economics.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_442680d09b1a449aa222e07ed0e8a435.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_71e06426babe4d159cfcae85c71fd5f5.pdf?index=trueIn PDF document text
    • http://xupaxemos.rf.gd/cash_flow_and_debt_management.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 5540 bytes
SHA-256: 059d4c7fbe84641d4578daa285413b26206862d9b9817836cd14f9a6df373dc6
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10944 bytes
SHA-256: 763cce4ec10065db75f0abc4decab90a142d957820095a679edba5b218b2a736

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