Malicious PDF — malware analysis report

Static analysis result for SHA-256 3900f5ad7566627c…

MALICIOUS

PDF

89.7 KB Created: 2021-02-23 00:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d79c98aad6f59a00921b4ffdcf1fd41a SHA-1: dca2219c956727e126a0b0bdb6ac623d86216967 SHA-256: 3900f5ad7566627cf4332dd308a9a3f08851a7de0e20e5c2de506acf158006d7
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 it is part of a link farm designed to drive traffic to various websites. The presence of the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95' and the ML classifier flagging it as malicious strongly suggest a phishing or malicious redirection intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://maypoin.ru/123?utm_term=how+fast+can+a+tesla+go+from+0+to+60 PDF link annotation
    • http://medyayazilimtr.com/housekeeping_discrepancy_report_template5317w.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/46bdd5ec2.pdfIn PDF document text
    • https://napuguzexavuzes.weebly.com/uploads/1/3/4/8/134875267/97325441ad2.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/c31c65ab78e6.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/090fa90a3260f0a.pdfIn PDF document text
    • https://jolewewovu.weebly.com/uploads/1/3/6/0/136087062/fcbb721173f2f.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/1c29bef9fac4819.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/mipofuwimalulowotek.pdfIn PDF document text
    • http://bachanalytics.com/73911155460g6ese.pdfIn PDF document text
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/4517bd391723a.pdfIn PDF document text
    • http://sarkife.site/fishing_pole_for_crappiejchtj.pdfIn PDF document text
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/dununonivovo.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/dubai_weather_in_januaryf42yq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/free_implementation_plan_template_word.pdfIn PDF document text
    • http://fokogemuzaraw.epizy.com/americas_history_ap_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/homonyms_homographs_and_homophones_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/sedimentary_rocks_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/37062518961.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/vmware_workstation_12_keygen.pdfIn PDF document text
    • http://kuturonelavopif.rf.gd/rulejimofudiwe.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_off0001210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210A 5548 bytes
SHA-256: 06b6a9266bc79b1601f20875b2908ef974ad94e21b4bd4d84f208fad9f56ecdf
font_01_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 11148 bytes
SHA-256: 826c0d78302c28c11a15e4b3f080a326c14ac8e4e5e5013d2588e3eb5599764d

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