Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1b3e3009059b30…

MALICIOUS

PDF

73.4 KB Created: 2021-03-04 03:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c19068b2a9e685455cd67e9954e2106 SHA-1: 10e7648f2bbcd77772a8e2e0a7e178a4e358258b SHA-256: bc1b3e3009059b303e21275b077f181ddfa6ca4aafe1439e1d2634c6eb0874a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a campaign to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=st+charles+il+library+hours
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/8166249.pdf
    • https://jeluvuxibobuna.weebly.com/uploads/1/3/4/0/134017570/04f779.pdf
    • http://tur8osale.site/vifasopelawarerykyr7.pdf
    • http://lotsmen.com/65341244452wtum2.pdf
    • https://cdn.sqhk.co/gopuxipo/iYijjfy/spears_games_3d_snakes_and_ladders_rules.pdf
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/radanateribax.pdf
    • https://cdn.sqhk.co/lobinazema/fjaheSv/1st_grade_spelling_activities_printables.pdf
    • http://uaportal.site/84056581362r42og.pdf
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/9478124.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gezetega/wutijomu.pdf
    • https://s3.amazonaws.com/mufukep/wayne_dalton_9100_series_sonoma_garage_door.pdf
    • https://s3.amazonaws.com/tiniruru/algoritmo_de_la_division_ejercicios.pdf
    • https://s3.amazonaws.com/jopomodilamego/norafokovapajisiveteg.pdf
    • https://s3.amazonaws.com/guvovigo/knights_of_the_old_republic_xbox_one_x_enhanced.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_off0000e412.bin
4c8477c84e525fdc56cc2b44c094742cda5040eb4abfb784fd646354a90be7ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 5232 bytes
font_01_sfnt_off0000f5d9.bin
877716e7afa401c29ea36eeeada0359ac3dd7a64065b0171a6603236e6ce58fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 10204 bytes