Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb916756f6d49306…

MALICIOUS

PDF

71.3 KB Created: 2021-03-29 09:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ef4acd4c7c05becd353021d719ea76a7 SHA-1: ca6274858f4b3dfd54eb04fdeb6e476baeffa0bc SHA-256: eb916756f6d49306bd166f25ab6a264559e7d6867e9d848d44fc84206c965c82
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, https://ponafet.ru/award?keyword=ejercicios+just+already+yet+ever+never+pdf, suggests a potential phishing or spamming campaign. While no scripts were explicitly extracted, the presence of numerous external links and the ML classification strongly indicate malicious intent, likely related to directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://ponafet.ru/award?keyword=ejercicios+just+already+yet+ever+never+pdf PDF link annotation
    • https://cdn.sqhk.co/dufimogemeka/egdhgmR/pogazodinepeniwusadogexez.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/odisha_railway_map.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/jukuvuwizev.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/capsaicina_beneficios.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/hLOIzWM/dual_monitor_sit_stand_desk_converter.pdfIn PDF document text
    • https://komomagifagele.weebly.com/uploads/1/3/4/7/134705279/fd950f507270fd.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/hefQjdj/falaxipekibuvajot.pdfIn PDF document text
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/62c904d.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/gebukil/bezprzewodowa_kamera_cofania_wifi_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/intermittent_fasting_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/audiomack_hip_hop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/12688180315.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/berkshire_hathaway_annual_stock_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/zofakapiwozikegu.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/kindergarten_addition_and_subtraction_worksheets.pdfIn PDF document text
    • http://riledabetime.myartsonline.com/93476344781.pdfIn PDF document text
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_40708a0d0d3b4cce87574c37a42e9e53.pdf?index=trueIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_21f81bc938a54fa7bfac67723af375a6.pdf?index=trueIn PDF document text
    • http://ziwivazud.onlinewebshop.net/great_god_of_wonders_sheet_music.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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 5344 bytes
SHA-256: 167fc4fd685f75426a9eac19995b10faa9805b04a2054158681466dcbf5bdf87
font_01_sfnt_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 11492 bytes
SHA-256: ac77620e0105a29ed9e975bc31fc511699092fe917c39e0e9bb77d6e6efdce4c

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