Malicious PDF — malware analysis report

Static analysis result for SHA-256 e651cfc0ae26bbaa…

MALICIOUS

PDF

155.0 KB Created: 2021-01-31 10:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 75a386c35a4f3ccd0c4c616d6b397c1e SHA-1: 5e87121d518e54b70f0fa9ebc52a5903cc54130f SHA-256: e651cfc0ae26bbaab6b15649e2b6cd8e41fc345ce315b2ccc4594feb7405370c
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristic firings indicating malicious links and redirects, including a link to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links and the nature of the PDF suggest it is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://traffking.ru/wb?keyword=space%20colony%20name%20generator In PDF document text
    • http://usblighter24.site/funny_video_download_sharechat_app37d5g.pdfIn PDF document text
    • http://2220202.ru/belutozokoxdvro.pdfIn PDF document text
    • http://liko-sneakers.com/57503716428linj9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff4e1652a3fd.pdfIn PDF document text
    • http://tertov.xyz/kreekcraft_ranking_piggy_skins96jdv.pdfIn PDF document text
    • http://izzzaaa.space/14409943581vy398.pdfIn PDF document text
    • http://experiment.website/weather_underground_seattle_hourly0371o.pdfIn PDF document text
    • http://torchqbfl.fun/bunemuxogomojafufr5.pdfIn PDF document text
    • http://wiinorama.fun/24755408707qej98.pdfIn PDF document text
    • http://save50.pro/sivoliturowonwlnu.pdfIn PDF document text
    • http://robertferrell.net/programming_erlang_joe_armstrongf391e.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/minodidisovoxqy6zb.pdfIn PDF document text
    • http://medicinfo.online/hemlock_grove_brian_mcgreevypgmea.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/vavale/fb_video_er_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/fizowavitikimogas.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/48593033786.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/azeitona_verde_informao_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/friendly_letter_template_for_elementary_students.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_off000222f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222F5 5280 bytes
SHA-256: 4b7391ea208e93d92c8b92668d6d59dd3f05dad597141fc04ca3c734bdffb574
font_01_sfnt_off000234e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234E4 12428 bytes
SHA-256: 62aaa887815b3a6d39cee093f4c5f8f4c0a1d4ee36256b27951aa53d4750412e

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