Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef305443b92d38b9…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 23:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b7d23fea17a649a99c1b9cbcf2763dd1 SHA-1: b44b95b74b95e5c10c6ff3cbc76abfb77cdafd73 SHA-256: ef305443b92d38b925d052553ed4a2b9b069f76abbe4dd64cf80175fa383cc59
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit users by masquerading as a useful document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • 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://dafemum.ru/123?utm_term=free+delivery+note+template+excel In PDF document text
    • http://gexopidikimo.mygamesonline.org/nalini_singh_archangel_s_heart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_6022106137147.pdfIn PDF document text
    • http://dowowuvaz.iblogger.org/bushnell_tour_v3_jolt_stopped_working.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/ggR9jeW/69746847097.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/ic5jbld/47640438275.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/jcmhfv4/2434159618.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cjfighc/2957429304.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/ijFgejc/lisogefa.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/LObVnhb/angry_crab_shack_surprise_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/SjcieM8/buccal_drug_delivery_system.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fd040c89e43b.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/lanipu.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/cGmheEj/wood_wallpaper_iphone_xs_max.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_6026cd3323059.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/ariens_snowblower_carburetor_repair.pdfIn PDF document text
    • http://ginizamiterog.22web.org/62065784065.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/ieieIrQ/nufadijegumifef.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/haoWmie/find_my_phone_verizonwireless.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupowelepidojek.onlinewebshop.net/76475945600.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/adventures_of_tom_sawyer_and_huckleberry_finn_norman_rockwell_collectors_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/35836827679.pdfIn PDF document text
    • http://pakakebif.rf.gd/accidental_prime_minister_book_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/negative_z_score_table.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_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5228 bytes
SHA-256: 3801a54d0b84699470c41522abcbdd80a974e2143ae3394c3fe631a5934458d6
font_01_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 10220 bytes
SHA-256: 364df0b9fce1f822a82ad0c87689508131c2355fe6bcd2552737b375941c4e84

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