Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6435427c5cbb6d9…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 22:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e43faf471a90a0fc81a0646c5b732bde SHA-1: 37ea4cdffe9e4e418fe390e97c56b64a5bce4068 SHA-256: c6435427c5cbb6d9d5e22727112a836834a57eb753ea8d4b875349fce98a2c71
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malicious content or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a link farm for SEO manipulation, likely to obscure the true malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection strongly suggest the PDF is designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=system+engineering+plan PDF link annotation
    • http://bcpzonasegurape2-viabcp.com/police_report_line_nswf7sxv.pdfIn PDF document text
    • http://kulinar2020.site/blizzard_stuck_at_07n0yp.pdfIn PDF document text
    • http://berkeciftci.net/business_process_modeling_book83aam.pdfIn PDF document text
    • http://busforpay.online/845799593708w2qo.pdfIn PDF document text
    • http://smartcoin.design/vetiritozitune4myzu.pdfIn PDF document text
    • http://wapuwesifatirok.iblogger.org/smartparts_digital_picture_frame_wont_turn_on.pdfIn PDF document text
    • http://bbflowers.net/proshow_producer_full_crack_khng_cn5sev.pdfIn PDF document text
    • http://ru-payment.casa/craftsman_18_inch_42cc_chainsaw_fuel_line_diagram4imgz.pdfIn PDF document text
    • http://yourdesk.website/how_to_get_rca_tablet_out_of_fastboot_moderpr5f.pdfIn PDF document text
    • http://train-home.ru/69948385961qclmw.pdfIn PDF document text
    • http://sushibara.net/touhou_mima_touhou_project_music_gameny9yi.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/86500993547.pdfIn PDF document text
    • http://tryadasert.online/4th_grade_subtraction_borrowing_worksheetsvz10v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzekuzabi.epizy.com/befilumoveli.pdfIn PDF document text
    • http://somupoxalinarek.rf.gd/how_to_search_quickly_on_quizlet.pdfIn PDF document text
    • http://xovijoj.epizy.com/rivuposonulawuxo.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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 5344 bytes
SHA-256: c642f22651b7efee6ae0751cd2f98207b093172f7206ec7b1e2c672efac3b262
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 11072 bytes
SHA-256: 258497001cbf95d697ddca8abc735087143d3af3eaa6b6a37672b680b1c455f3

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