Malicious PDF — malware analysis report

Static analysis result for SHA-256 787c4dc50617afe4…

MALICIOUS

PDF

81.1 KB Created: 2021-04-08 20:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05bf1a039e428f05fca973d4eae159c SHA-1: 2070c5427541c3538bcbe08cea7a7147b79931ee SHA-256: 787c4dc50617afe4893ccdcf444b442397d3271a772834ba8ac0a4eed4361b8c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure point towards a phishing attack designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=data+mining+examples+in+nursing
    • https://cdn-cms.f-static.net/uploads/4491412/normal_602d825108fbe.pdf
    • https://cdn.sqhk.co/wanifeloxege/ygejc3V/what_is_canine_guided_occlusion.pdf
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/morubupan_vobavake.pdf
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fd11286e83f3.pdf
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/986772c72ba63.pdf
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/2559051.pdf
    • https://cdn.sqhk.co/rekutadis/fiageoV/archer_hotel_austin_discount.pdf
    • https://cdn.sqhk.co/senuziker/ifjPigP/dikugesatosori.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/jepep-pavoko.pdf
    • https://cdn.sqhk.co/pulazapusaw/ciaASic/basketball_mini_fridge.pdf
    • https://static.s123-cdn-static.com/uploads/4484605/normal_60090abd80659.pdf
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5feeec0a7decb.pdf
    • https://cdn-cms.f-static.net/uploads/4375704/normal_6025f21cefca2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83598059-a23d-4406-8041-d964a7ceeec2/stock_investing_for_beginners_2020.pdf
    • https://uploads.strikinglycdn.com/files/9ec331ea-9ae3-4d26-98e2-9142a3c9642d/how_to_connect_ge_universal_remote_to_roku_tv.pdf
    • https://uploads.strikinglycdn.com/files/0f13807e-ef9d-4d5a-8bd9-a5164d9f7435/how_to_fix_kenmore_microwave.pdf
    • https://uploads.strikinglycdn.com/files/08499bf3-3190-4d61-852e-ac0124780b49/79569394196.pdf
    • https://uploads.strikinglycdn.com/files/60902f03-32b5-41bb-8348-7c81def9b448/zuturisisewumeg.pdf
    • https://uploads.strikinglycdn.com/files/97bca211-dad6-400a-8b47-2e364a3678fe/android_app_development_for_beginners_86_hours__79_apps.pdf
    • https://uploads.strikinglycdn.com/files/83746de5-bc56-4911-bdff-4706173e56be/theoretical_probability_worksheet_7th_grade.pdf
    • https://uploads.strikinglycdn.com/files/0322585d-b509-4483-b8c6-727984e46c78/80839414517.pdf
    • https://uploads.strikinglycdn.com/files/05bc8e2e-0b72-4f6d-8054-5652814fa766/how_to_manage_stress_in_life.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd6.bin
802c781e10662383c519cf59e6cab2acd4f50de53807cd3a6d4c01639f6c7f13
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 5208 bytes
font_01_sfnt_off00011182.bin
c9791ffbdd014940be47e6a1e41493b71d2b326f9df53fff027ea22a065b9faf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 11036 bytes