Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e4ed4b7a264476…

MALICIOUS

PDF

84.6 KB Created: 2021-05-01 06:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eba54fbe303da7c89f5f0cf7a0a9bd38 SHA-1: bab00f924c3533cc91a70f99eaae0c2ef0f306bc SHA-256: 38e4ed4b7a2644761fc9affffa610b9782b76001ec7d0023b11a21ea15efee6b
186 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 pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=english+composition+1+college PDF link annotation
    • https://cdn.sqhk.co/resozasevej/b77QBgd/stick_go_pixel_adventures.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/aRjgthc/41942380252.pdfIn PDF document text
    • http://auth02mobility.com/70315803031a76pc.pdfIn PDF document text
    • http://pedalini.club/sample_narrative_report_on_earthquake_drill_20166dv2n.pdfIn PDF document text
    • https://dikivofugejal.weebly.com/uploads/1/3/1/4/131453076/0774cc8ab.pdfIn PDF document text
    • http://adminhalil.com/davotoxowokevupameb3f7e.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/bgiE0ic/javafx_8_css_reference_guide.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/6604819.pdfIn PDF document text
    • https://lumevukivejus.weebly.com/uploads/1/3/0/8/130874583/65e704801a09.pdfIn PDF document text
    • https://ruwixotuso.weebly.com/uploads/1/3/4/1/134131383/gigujobigugatazo.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/idujjfG/ono_sve_sto_znas_o_meni_knjiga.pdfIn PDF document text
    • http://itravelgr.com/f1_mobile_racing_bahrain_setupk9dq0.pdfIn PDF document text
    • https://zatugole.weebly.com/uploads/1/3/1/8/131856706/6452137.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/30af5ae9d.pdfIn PDF document text
    • http://arfesopt.com/roman_catholic_mass_in_englishtou55.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/9271286.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/dQIsggN/mixizufawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2ce25f29-9c29-4947-8eee-cc20e3e94ec0/18899821663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82285d02-da6f-4ec1-9556-b989f73d8809/how_to_fix_a_paper_shredder_that_wont_shred.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba79c723-8f29-49bd-aeba-59387277bbaf/keep_on_the_shadowfell_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6901204-8ff6-415c-b93e-4955ce37e924/nojowabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d673dc2-ad43-4964-aa13-3c6b329879eb/48718276409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61128f40-78fa-4208-943d-0f4f4a68e1b9/graphtec_cutting_plotter_ce5000-60_price_in_mumbai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4870fa-c5db-494a-bf31-38c726ae9d6d/what_does_it_mean_when_maint_reqd_light_comes_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f071e21c-5645-46ad-a23d-24cf016c9158/65087603571.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 4840 bytes
SHA-256: f6e62ab7941efa1ad68726df31cbd376cd05353d056a3ba633c45c39e7b73f88
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 10996 bytes
SHA-256: 9932a2f887169f3624b8307889e842d1eda12c91b61f1d1d6e65863f1e37fc96
font_02_sfnt_off00013684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13684 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e