Malicious PDF — malware analysis report

Static analysis result for SHA-256 d593e7b5555b3508…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 05:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5727bff30328ad2772eceb4b68a75394 SHA-1: e00ad5eaaad2267d405e1422374af76bf5bfe453 SHA-256: d593e7b5555b35089b8f2d9ac49ffe6b66a10169cffc206ea446731562a6ab14
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation scheme. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malicious redirection attack, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://bologen.ru/award?keyword=cinderella+man+book+pdf PDF link annotation
    • https://cdn.sqhk.co/pujixefan/eFl1JBE/dyngus_day_south_bend.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/jgjhjig/5_best_offline_gps_navigation_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/49oE3ym/rubber_chicken_song_bad_guy.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/ghBijhh/bingo_caller_program_download.pdfIn PDF document text
    • http://cashfree.store/14093578608sjdag.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/xhaXZEP/coda_shop_diamond_free_fire.pdfIn PDF document text
    • https://lepudumewo.weebly.com/uploads/1/3/5/9/135962044/pixaxakiwidaki.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jrA7cTL/fubonusagosepofexunusove.pdfIn PDF document text
    • http://artyom.guru/public_administration_jobs_salary_in_nigeria10frd.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/Ejwgfha/sasafopox.pdfIn PDF document text
    • http://paganel.world/sifaratenibegapakijusurelcs8yc.pdfIn PDF document text
    • http://rezonansmusic.com/moxewisizetavsdx0.pdfIn PDF document text
    • http://gbo.guru/xibefesokazakabirupopiwullc66q.pdfIn PDF document text
    • http://raicen.com/51637738037mehel.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/hiiggcf/87110989064.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/vhc7uge/weird_gross_facts_about_the_human_body.pdfIn PDF document text
    • https://cdn.sqhk.co/dobopejig/UigBp4s/green_mucus_poop_pregnant.pdfIn PDF document text
    • https://nepopuzabigeju.weebly.com/uploads/1/3/4/8/134856357/simafa.pdfIn PDF document text
    • http://lalashoppen.online/bloom_taxonomy_affective_domain_slidesharevi8f9.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/3igjWhe/vagoniwoposulenuzasibolef.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/miiq5yq/pro_mx_3_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/oUVHAD0/kufapizibotevukurudojirij.pdfIn PDF document text
    • https://kowirakixodoxe.weebly.com/uploads/1/3/4/4/134467502/famanituzoripolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 5120 bytes
SHA-256: 2c587be5a80d72b9b8780a9d3ff0b1a701777f55dd609cef13cea7fa048dc711
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 11116 bytes
SHA-256: 297b1a17079e303b839b9613a26ad9f2a86552278b098e2c5f981063190fdb65