Malicious PDF — malware analysis report

Static analysis result for SHA-256 357bffb8c4e9a8f4…

MALICIOUS

PDF

99.5 KB Created: 2021-03-05 00:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6f9807ade6c9ad8865fa43f5a68068ce SHA-1: c226fbf64f443d691a8f009ea1d8acc85fd966e5 SHA-256: 357bffb8c4e9a8f4dae0c709c8afd4ef6ef0ada3ad526826eb6a80200c937914
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=thinking+well+is+wise+meaning+in+english PDF link annotation
    • http://sputnews.com/the_solar_system_pictures_and_namestx65t.pdfIn PDF document text
    • http://jufimeja.iblogger.org/81777830287.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/vagevifurenobupujakurelu.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/the_complete_works_of_swami_vivekananda_drive.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/24349880478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64bd680a1b.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/1st_grade_math_worksheets_word_problems.pdfIn PDF document text
    • http://lady-bug.club/birthday_images_for_nephew_freesc9s2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444623/normal_5fe2452a1782c.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/best_crossfit_training_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6026c15931346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/premiere_pro_transition_presets_free_download_2020.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/did_charlie_kill_himself_in_flowers_for_algernon.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/ditigomuboxuzapikuxe.pdfIn PDF document text
    • http://nejidaveza.rf.gd/what_does_clover_pos_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/cage_questionnaire_alcohol.pdfIn PDF document text
    • http://rezemefu.rf.gd/duka_hithena_adara_wadan_sinhala.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_off0001480d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480D 5108 bytes
SHA-256: 75f81b6873775d2abde0d41970177ae291d46a6851aba848e8d4bab0289839f1
font_01_sfnt_off00015960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15960 11204 bytes
SHA-256: c6fc6f543e385a6734ef2419ad3280fe505854762be3c5ced368f1e8761c37b0

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