Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdb2e098e7efad1…

MALICIOUS

PDF

94.4 KB Created: 2021-02-27 23:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 210429962e998fdc7e7bc82b8ad9c2d7 SHA-1: bf05f32f525045a5392a1c2834cd0d629a3294e1 SHA-256: 5bdb2e098e7efad13c903ff19e7fcb1d0519fad098f5202d1ea3f4e8852d90bf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The primary purpose appears to be directing users to potentially malicious or unwanted content via these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/aws?utm_term=what+is+the+point+of+nicomachean+ethics PDF link annotation
    • http://sujurafumub.22web.org/vuxefivosakabubenefosapo.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/2350021.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/1909129.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/parepixelukatored.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/1653303.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/fhexvJi/solar_2225_wire_feed_welder_for_sale.pdfIn PDF document text
    • https://tiwuvaxitunux.weebly.com/uploads/1/3/0/8/130874175/4c786ab.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/78595009563.pdfIn PDF document text
    • http://wazinufezil.iblogger.org/flounder_gigging_guides_port_aransas.pdfIn PDF document text
    • https://sonoxezepokamev.weebly.com/uploads/1/3/3/9/133999938/kuwugexuvetilumotoj.pdfIn PDF document text
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/nefiwe.pdfIn PDF document text
    • http://raliwoze.iblogger.org/china_visa_application_form_vietnam.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/Njeidgg/34118943468.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukukuwozar.epizy.com/76174705629.pdfIn PDF document text
    • http://xijodakofifo.epizy.com/ergonomic_assessment_report_sample.pdfIn PDF document text
    • http://tawatibajat.rf.gd/blood_sweat_and_tears_free.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_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 5140 bytes
SHA-256: 31998a20397eebbaaa3f41458b2fb9b8b93696f422cb22b8fb2d49aae321e918
font_01_sfnt_off0001482d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482D 10412 bytes
SHA-256: 876893a867aab0e1a149c9de0d8a131709c5fdaa721e07b09b7d59b1d146bfc3

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