Malicious PDF — malware analysis report

Static analysis result for SHA-256 243b59c095e5ba3d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-28 01:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 730352d8d6929c51d6be28a464e5c856 SHA-1: 99d97335a37ab5d66d1e57b8399e003c02f1d405 SHA-256: 243b59c095e5ba3d8843a3e44a2bb85bb931dcd03b67b5b161316e8722282c66
186 Risk Score

Malware Insights

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

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 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
  • 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://lozipotod.ru/award?keyword=financial+analysis+report+of+a+company+pdf PDF link annotation
    • http://cmbespaceclient.xyz/anggota_tubuh_dalam_bahasa_arabhtf5b.pdfIn PDF document text
    • http://matteset-spon.space/migususumosezovooth2.pdfIn PDF document text
    • http://vnds-v.website/formel_til_areal_av_sirkelsmf73.pdfIn PDF document text
    • http://pe50off.info/account_sheet_in_exceluq31r.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/cVAlieE/micro_rpg_games.pdfIn PDF document text
    • http://namelesssouth.xyz/126638440269840o.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/F5jaVgc/stargazing_bubble_tent_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/hfeiivB/70863131993.pdfIn PDF document text
    • http://teren.fun/evans_partial_differential_equations_amssj42f.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/Ohijagc/kill_the_dictator_mod_apk.pdfIn PDF document text
    • http://mebelrostov.ru/201132094491pnie.pdfIn PDF document text
    • https://cdn.sqhk.co/juxajomuz/icjaHlG/lanugikekemugakerirapew.pdfIn PDF document text
    • http://wonder-ita.fun/converting_fractions_to_percents_printable_worksheetsxhc6z.pdfIn PDF document text
    • http://easylearning.space/3d_animation_software_for_ipad_freec9skq.pdfIn PDF document text
    • http://reduslimitaly.website/biblia_de_estudio_reina_valera_1960_para_descargar_gratisfekh2.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/jgdiaGA/81716229293.pdfIn PDF document text
    • http://thelandofbadideas.com/149776701584e70l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_8c133dd53ffb4f35b98de95e1b4db144.pdf?index=trueIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_6b0b4815a9cd45e9b98563e0a98f8525.pdf?index=trueIn 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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5360 bytes
SHA-256: 303b230821cb3d8e53ff22c68306c39327010247141334a0a771c1caa22686f5
font_01_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 10140 bytes
SHA-256: da21f5d4b079704dcdc2bd82171505a231816f7f9228ae8c37641e354a0405be

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