Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b103b0b8fe5bb1…

MALICIOUS

PDF

74.4 KB Created: 2021-03-18 02:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e86085165e39e7178f324d5df32798bb SHA-1: 4958d0c33acbf0195632a81920c285c970cb9cc4 SHA-256: d8b103b0b8fe5bb105cd7ba537dec8b1985f86e205d9906fb17ae744fa1a0e13
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The file contains a large number of embedded links, suggesting it functions as a link farm designed to direct users to potentially harmful websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+write+a+null+hypothesis+ap+bio In PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/5170193.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/mituxapusanaz.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/dunixexofedepedopitu.pdfIn PDF document text
    • https://zajedipadere.weebly.com/uploads/1/3/1/3/131398131/580790.pdfIn PDF document text
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/jokifa.pdfIn PDF document text
    • https://bugukafu.weebly.com/uploads/1/3/4/4/134490359/4000768.pdfIn PDF document text
    • http://tigitaja.iblogger.org/39732558851.pdfIn PDF document text
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/subimarenemufeso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodinola.rf.gd/how_accurate_is_ww_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/if_the_information_is_correct.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/42761087773.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/94998121755.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/bosquejos_de_sermones_cristianos_para_predicar.pdfIn PDF document text
    • http://jobupozedud.epizy.com/islamic_banking_in_malaysia.pdfIn PDF document text
    • http://gorulilul.rf.gd/wozetamivakixemowebosego.pdfIn PDF document text
    • http://venijulezazowo.rf.gd/lezitatatawoxip.pdfIn PDF document text
    • http://kiroxivox.epizy.com/siwadet.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/google_sheet_organization_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/15335958980.pdfIn PDF document text
    • http://tosodesuvivat.epizy.com/performing_catheter_irrigation_ati.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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 5200 bytes
SHA-256: 9f8145c4a95208596ed447ebd72fbb9239d19343208aca198be78b2ac2ef9cd6
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 11444 bytes
SHA-256: 8e40e4fd90ed70f8d6c34b50218e325770e025f9675ffc27c227182086ed93e3

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