Malicious PDF — malware analysis report

Static analysis result for SHA-256 8287b6d59fbdf003…

MALICIOUS

PDF

81.1 KB Created: 2021-03-31 07:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cb9cc449e29dbf58184cc83fd17dd656 SHA-1: da72fe02a4ada9c87a049c47b4b38cab103844ad SHA-256: 8287b6d59fbdf0034d39285c017741dbd8e21bfd1a5111f808b4bc37c2971c15
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=schistosoma+mansoni+life+cycle+pdf PDF link annotation
    • http://ulekschool.online/860762986409fe5h.pdfIn PDF document text
    • https://zonulezewuras.weebly.com/uploads/1/3/4/8/134890742/ee9373b718.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/gg18wBh/sandisk_memory_zone_apk_mirror.pdfIn PDF document text
    • http://goldotzyv.ru/nogapukokojuwisulodonogetc9yo8.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/ixiceic/8858342273.pdfIn PDF document text
    • http://indir-kazan.com/zegerefubyw3m.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/wazikog.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/iijcG6T/xonojitevufener.pdfIn PDF document text
    • http://tameenegypt.com/all_in_one_messenger_appj8t4z.pdfIn PDF document text
    • http://garderob-podolsk.ru/how_to_determine_polarity_of_a_power_supplysv32f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_602269423f700.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/ghiajea/dixanaguvesurinofi.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/why_wont_my_kenmore_dishwasher_start.pdfIn PDF document text
    • http://jinobuzid.scienceontheweb.net/bullet_journal_ryder_carroll.pdfIn PDF document text
    • http://geesecam.com/voxejabj7kw.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/tepurus_diguriwazefupub_mejujuzilu.pdfIn PDF document text
    • http://salearea.pro/93074045266vputj.pdfIn PDF document text
    • http://pollsexpert.com/jesus_calling_daily_devotional_2021yt09h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6047f0c1ea80f.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_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 5504 bytes
SHA-256: f716f58e362599e3a17a4f4373ffab6f1054eba434463c545a60ef107fc12c7f
font_01_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 10312 bytes
SHA-256: 035b9521e39b284c57ed7a27e42bdbae045d29026113bc3eac6d5958b5f993e7

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