Malicious PDF — malware analysis report

Static analysis result for SHA-256 de54782dd7986c53…

MALICIOUS

PDF

93.5 KB Created: 2021-05-01 23:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ba761aaad0bb8a6f277517ded6488688 SHA-1: e23e986643c7bde2ddd0a5750158408caaaea953 SHA-256: de54782dd7986c53f1f47abc495d5e04ddd6b5695308e3ad30b78c0ab3e6b844
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://soxebez.ru/strik?utm_term=power+of+media+and+information+in+education PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460682/normal_603138f19bd55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_6058b4352ecf1.pdfIn PDF document text
    • http://xikofav.iblogger.org/biometria_hematica_valores_normales.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_60136bb0a3604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_60092a457e0a5.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/hr_balanced_scorecard.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/automatic_door_bell_project.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_60563c8774e2b.pdfIn PDF document text
    • http://storeeuro.info/text_features_1st_grade_anchor_chartalke0.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/panasonic_kx-tes824_installation_manualqflx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482403/normal_60294d0acee94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_600a546db1b4d.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/11348142139c53wc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6040b8078c403.pdfIn PDF document text
    • http://lunesygets.xyz/912575090988pt87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazosubegus.epizy.com/cruxes_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/76739672834.pdfIn PDF document text
    • http://boterusor.epizy.com/dell_xps_8300_ram_upgrade.pdfIn PDF document text
    • http://gefuxexo.epizy.com/94408888640.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/30643395842.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/katewuruwuwazuwibutobotu.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/sony_str-k502p_review.pdfIn PDF document text
    • http://nematamaduwos.epizy.com/4k_video_website_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/jumble_crosswords_by_david_hoyt_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 5048 bytes
SHA-256: 204d4553aeda80a4f07c894286c59b52d476638202028ab369c2335e5fc8fef4
font_01_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 3156 bytes
SHA-256: 009948d8f0413d05a4d631eaf3b230e327920034bbe93e610944cdbae319a6bd
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 12064 bytes
SHA-256: 25e34b426eadbb52ccac931694ef05bff2062f5f96c1aa27c53a7998b6f9c75b
font_03_sfnt_off00014824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14824 16372 bytes
SHA-256: 5074365b80b478aa2b30964909464beff88c5463149618011072845eb233e597
font_04_sfnt_off00015dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFD 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff