Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4b89f85e1abc65…

MALICIOUS

PDF

96.6 KB Created: 2021-03-22 16:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c781f33c23ffc93152375fcdd5ea9cc SHA-1: 64c592f722d31a6dcc096deb852ecd768369714b SHA-256: 1f4b89f85e1abc653b421abf37dea80fdb840ad6a548bd98f7cf01075481aa2a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm designed to attract traffic. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely used for phishing or to serve a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=average+salary+in+dubai+for+marketing+manager
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/sumebe_buvoderel_rogafogiso.pdf
    • https://cdn-cms.f-static.net/uploads/4402262/normal_604af69324377.pdf
    • http://rirelavemug.iblogger.org/net_framework_4._8_runtime.pdf
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/2225d0dface8.pdf
    • https://taguraridefukal.weebly.com/uploads/1/3/4/4/134446716/9823590.pdf
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fd3d718c5144.pdf
    • http://50off.pro/vaaste_lyrics_whatsapp_status_video503tq.pdf
    • http://getfreecreditreport.info/38176943358ni56k.pdf
    • https://disepijov.weebly.com/uploads/1/3/1/4/131438002/7240922.pdf
    • http://fenellalucynelle.info/north_star_imaging_flower_moundpn6sp.pdf
    • https://kakenemewaxe.weebly.com/uploads/1/3/4/6/134655752/wepujuwezi.pdf
    • http://strahauto.website/zexikegenigurikikoxowefz07k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1309691-25a2-4f46-b617-3c3a43bc8397/what_is_the_environmental_planning_and_assessment_act_1979.pdf
    • https://uploads.strikinglycdn.com/files/44dd078c-c2a5-46ad-9fc3-7fec8faafaaa/suzuki_quadrunner_250_service_manual_download.pdf
    • https://uploads.strikinglycdn.com/files/54663b46-f914-40d3-a707-2b777bfabb92/kigejevanolasopaluvez.pdf
    • http://dowinoxerirud.epizy.com/the_road_not_taken_story.pdf
    • https://uploads.strikinglycdn.com/files/cf9d97eb-68c0-4dbe-867b-69f756727632/36972379937.pdf
    • https://uploads.strikinglycdn.com/files/a677ac90-b59a-40fd-81fc-40abc20c70ae/zumeseniragetevutox.pdf
    • https://uploads.strikinglycdn.com/files/27e61d8a-c0e0-475f-be38-adc45ab22796/fujitsu_halcyon_dc_inverter_control_manual.pdf
    • https://uploads.strikinglycdn.com/files/009daba6-4703-4521-a07f-79326a5cbd17/71522403221.pdf
    • https://uploads.strikinglycdn.com/files/638689ce-9f7f-44f9-bfe2-23d036352ed6/what_is_the_purpose_of_anode_rod_in_water_heater.pdf
    • http://zumepif.rf.gd/51426446173.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121b5.bin
5bd8286bf341d050ec7d3e46ecc71d758c27920a667e555a194b2c79afd67dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 5584 bytes
font_01_sfnt_off000134b4.bin
76cf6c19cd327c2f9870511e4c93cfa756e60a8fe7decda8d8ef2e2cbac60402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 12364 bytes
font_02_sfnt_off00015ebd.bin
f9aed4753917d6cf146e06ba1537073da0a938f26cee378e4db1325f2450528e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBD 16260 bytes

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