Malicious PDF — malware analysis report

Static analysis result for SHA-256 44759763d740c1a1…

MALICIOUS

PDF

75.2 KB Created: 2021-04-15 06:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e832819cc167499331d2423e2b3a6a31 SHA-1: f1c0e54f6efd5c78df32dc2be28f4b4c8bcb6a91 SHA-256: 44759763d740c1a1a41e42f0e3a2722514b01646c658af13cc288edb9d060183
192 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious links suggests an attempt to phish users or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=d%2526d+3.5+cleric+stat+priority In PDF document text
    • http://pazujiz.mygamesonline.org/17069066368.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/TpYkidK/81437371776.pdfIn PDF document text
    • https://cdn.sqhk.co/zisafebu/yFEhiOv/oracle_ebs_r12_forms_log.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/1Sgc7jh/gear_club_true_racing_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/cgjftIw/bakumoxiwuzibogosenuxi.pdfIn PDF document text
    • http://copyrighthelpptteam.com/totofouv2qz.pdfIn PDF document text
    • http://endi-itali.space/jerorezekujudipakavevimikzay.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/ncert_english_grammar_book_class_3.pdfIn PDF document text
    • http://onlinekartiadesi.com/pabapagafojixozg2hff.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/haKNhOT/77050555138.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/atharva_veda_malayalam_free_download.pdfIn PDF document text
    • http://100p-f.ru/booster_pac_es5000_battery_chargericm5m.pdfIn PDF document text
    • http://wexypay.icu/8596743763wer39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/86313313337.pdfIn PDF document text
    • http://posikin.myartsonline.com/seinn_alleluia_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43df99d8-2167-41d8-8133-fdbd0d3ea006/46165933684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614a6b59-8f6f-49ba-8ebc-2d57420ecd9d/hearts_of_iron_3_ww1_mod_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d2ce0f-1899-4219-8456-32a9d5226da4/how_to_equip_a_trailer_in_offroad_outlaws_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358152e1-efaa-4623-aae3-5183074db7c1/how_to_calculate_scale_model.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/theoretical_framework_about_absenteeism_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88dcf92-1cb6-44fa-8634-cdaa4216c025/50918854637.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_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 4156 bytes
SHA-256: bb1702a9e9b617346157f9ea6f36cc14559c37d4a4a2cf683ebd57dce9d2c082
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 11596 bytes
SHA-256: ffa12c3f7f67d695c8de1989dc98cb6d19a3debe7edf02cb03929f8b6a78b8a2