Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fc330be3d45b55…

MALICIOUS

PDF

76.0 KB Created: 2021-03-01 00:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 29303c3caf2685109c0ae84d8e2f528e SHA-1: 5497a89ed574dd1ee9a5d2fc5793b0ac1eb91c33 SHA-256: e8fc330be3d45b55a8fc8307815ca4a37983f4de59831b3b1cc1a44b9802d5fd
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, indicating a likely phishing or malware distribution scheme. The PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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://jacksth.ru/aws?utm_term=types+of+juice+for+mimosa+bar PDF link annotation
    • http://ouily.xyz/is_guidepoint_global_advisors_legithiqel.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/qP7Thds/free_online_air_hockey_glow.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/GXTBVji/ice_cream_running_dog_pillow.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/eadd1ffc1e89d19.pdfIn PDF document text
    • http://xitnet.fun/notuf9z7ld.pdfIn PDF document text
    • http://gnatural.space/what_is_the_wps_button_on_my_arris_modemnuqwm.pdfIn PDF document text
    • http://batmbatm.ru/19379665814l15e7.pdfIn PDF document text
    • http://organicnu.info/fichas_de_consejo_tecnicojfh34.pdfIn PDF document text
    • http://smartcreditcheck.info/service_blueprint_template_visiofqxz7.pdfIn PDF document text
    • http://dompodklyuch.com/metodologia_do_trabalho_cientfico_lakatosv1xwz.pdfIn PDF document text
    • http://sedouche.xyz/josikujipomotixudicjqpu.pdfIn PDF document text
    • http://appeal-ig.com/64485072443eu7um.pdfIn PDF document text
    • http://bet-info.ru/fpga_xilinx_tutorialpwee1.pdfIn PDF document text
    • http://smallita.space/punobejoxotole5su8j.pdfIn PDF document text
    • http://healthyforczechrepublic.site/surviving_sepsis_2018_guidelinesccpcp.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5396 bytes
SHA-256: 8108f0e3bf72023f522afa3ba00d504fa8f7c0a84ce04c2c58aa293be8bd25ea
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10676 bytes
SHA-256: 5e61cc057cb2a8ae02170f21910542accf9167089df3bf89c0d439909e560b8f

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