Malicious PDF — malware analysis report

Static analysis result for SHA-256 b950de8b4b7b806e…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 21:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 876f79f1e74f864efcc3c8fc21d1d072 SHA-1: 25a769fbde9593789ca780c46080df7e451d6eec SHA-256: b950de8b4b7b806e8a9d53fda523e1ca8035b433a8c4ec1e40d5d2af0824c50a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. It contains numerous embedded URLs pointing to potentially malicious or phishing sites. The presence of external URIs and the link farm structure suggest an attempt to redirect users to attacker-controlled infrastructure, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/aws?utm_term=naruto+boruto+card+game+rules+pdf
    • http://copyrighthelpcentral.com/what_is_another_word_for_stormyb4xsv.pdf
    • http://kepukarob.sportsontheweb.net/animal_farm_character_chart.pdf
    • https://static.s123-cdn-static.com/uploads/4486356/normal_60008af4ae690.pdf
    • http://tofugezupeb.mygamesonline.org/thinking_in_java_download.pdf
    • https://cdn-cms.f-static.net/uploads/4418558/normal_602230c0785fa.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_60183028928a7.pdf
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5fe3a278877ef.pdf
    • http://9gusevshop.website/zarinidutubiwov9no7c.pdf
    • http://mudixefibewab.mywebcommunity.org/marvel_movies_in_order_to_watch_avengers_endgame.pdf
    • https://cdn-cms.f-static.net/uploads/4454990/normal_6044fda1a35f6.pdf
    • http://gepavozo.mygamesonline.org/85485465801.pdf
    • http://dafilor.iblogger.org/how_to_check_a_black_and_decker_battery_charger.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/folexapurilowe/how_much_does_medical_lab_technologist_make_in_canada.pdf
    • https://uploads.strikinglycdn.com/files/8ae9ae50-682a-4b08-89d3-e290871ceb41/90014462119.pdf
    • https://s3.amazonaws.com/pexodugosa/tapalotewilupe.pdf
    • https://uploads.strikinglycdn.com/files/87f79e88-a58f-4751-9cc0-a721b58bfaca/2006_ford_e350_service_manual.pdf
    • https://s3.amazonaws.com/lerezazo/abcd_rhymes_video_mp4.pdf
    • http://tulukinuloze.epizy.com/fufujelex.pdf
    • https://uploads.strikinglycdn.com/files/5a652ccf-ba81-46b6-961e-7ed131e32cf9/outlander_free_will_cast.pdf
    • http://diwixadareji.epizy.com/87138707241.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a8.bin
152af1606739df63741428155c3ca134cd13907628791fbea6b48a409592fa89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 5584 bytes
font_01_sfnt_off0000fa90.bin
3bf61f97163b00f32678cc0daf9e47e19fce886c506e50254f29a8a76cf2fdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10364 bytes

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