Malicious PDF — malware analysis report

Static analysis result for SHA-256 a165b13f1f1821bb…

MALICIOUS

PDF

67.8 KB Created: 2021-02-12 04:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 66c087dcb4b78e0c145bc2cb1cbb891e SHA-1: 219215c3cfc73e9e8ff1048c48ef8d92ecdac3f7 SHA-256: a165b13f1f1821bbacf9b0968645c8d7f52809e508571699c075454e03a5be65
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/wix?keyword=photosynthesis+and+respiration+worksheet+answer+key In PDF document text
    • https://cdn.sqhk.co/mewivupa/LgeSjg5/14623109673.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/mumajadazudiz.pdfIn PDF document text
    • https://cdn.sqhk.co/buwisotubu/ghhiCjf/angry_birds_blast_2.pdfIn PDF document text
    • https://wulenewovifof.weebly.com/uploads/1/3/4/5/134588468/lubor_vopuwoposot_rulakuwodikipi_xoxomepuzo.pdfIn PDF document text
    • http://gasufulezexe.22web.org/60448357803.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/hgeSjcV/pinituw.pdfIn PDF document text
    • https://cdn.sqhk.co/mulepava/iDhjLgj/color_wheel_generator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jhaijoP/ocean_overlord_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/hfjciby/international_business_analyst_salary_in_canada.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/centrelink_real_estate_form_mod_r.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/Hiigdjj/87463132438.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamemoroza.epizy.com/suveramexoladekobuges.pdfIn PDF document text
    • http://gujugune.rf.gd/aurangzeb_movie_coolmoviez.pdfIn PDF document text
    • http://toduwez.epizy.com/97718260791.pdfIn PDF document text
    • http://mevililuxe.epizy.com/jashn_e_bahara_hd_video_song.pdfIn PDF document text
    • http://romezegipoxo.epizy.com/dominos_meat_lovers_pizza_nutrition_information.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_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 5272 bytes
SHA-256: 811dedd3944c3efe779bdab3fe6b283c2039f945397736328c0fb30b935e99f6
font_01_sfnt_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 10080 bytes
SHA-256: 65f6a13c10671860ef44fcb2aa50a186188bb5abf8be80a33b7f0df571350101