Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e1d96a4bcd1377…

MALICIOUS

PDF

84.9 KB Created: 2021-04-02 17:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7408cc60653bb1b9eac468866619b8e9 SHA-1: 49d3369fea8489eb6747f73ccab389a582e310e8 SHA-256: 76e1d96a4bcd137726c225c565397952fc31398f8f04dec9296bf42bcea299ca
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm strategy, which is often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

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://lozipotod.ru/wix?keyword=robert+forrest+and+gena+rowlands PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451756/normal_5fff5fa9864bc.pdfIn PDF document text
    • http://mafewagidimu.22web.org/glencoe_algebra_2_workbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_6017361c645a0.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/e9d7831c28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495558/normal_6004ccbdca3e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_605ee45ea4780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6052824a892f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_605967b497519.pdfIn PDF document text
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/movimebitajuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_60649f7fef48c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_5fdafeca09897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_5fd1b528ba79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5ffe98844642a.pdfIn PDF document text
    • http://bovakepixoworax.iblogger.org/gekexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujoselaserib.epizy.com/kixekujam.pdfIn PDF document text
    • http://zujebagita.epizy.com/barasat_weather_report_7_days.pdfIn PDF document text
    • http://wupopadena.epizy.com/important_dates_in_all_months.pdfIn PDF document text
    • http://nefaped.epizy.com/kibukojugo.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_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 5312 bytes
SHA-256: fe954f98704197451ed6177ed21c157b7859ab42a9ad7c7dd9047deca95b7411
font_01_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 11512 bytes
SHA-256: dd54bbc7dd8d1b59e412a7c85aa17c273a5efdc41db3ce77878871aefa523882

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