Malicious PDF — malware analysis report

Static analysis result for SHA-256 150f3ce8ed1972ad…

MALICIOUS

PDF

81.0 KB Created: 2021-03-19 13:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd79692324c679b6babdc1c0102d229 SHA-1: 7f8df3e5595bbbfb3705ce90a16c062befc79ba1 SHA-256: 150f3ce8ed1972adf796fffdc7aa1ddfee306df29c92059b4f65b456fe72afce
226 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 redirection scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xezojetit.ru/123?utm_term=augusto+cury+vendedor+de+sonhos+pdf
    • https://misirukizos.weebly.com/uploads/1/3/4/0/134017349/b9b7444b9a9683.pdf
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/darotazasogarelezob.pdf
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/0a2dbdc5c0a.pdf
    • http://dihtyar.online/complete_spring_framework_tutorialfso6w.pdf
    • http://arfesopt.com/7321074919754emx.pdf
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/bc7ba0c9c.pdf
    • http://nibelv.xyz/can_we_connect_bluetooth_headphones_to_lg_tvwwn01.pdf
    • http://leree6.club/botiba093we.pdf
    • https://pogusunuj.weebly.com/uploads/1/3/4/8/134874329/lezero_bavitelig_dimemejivex_mabom.pdf
    • http://lifeshop.pro/why_wont_my_hp_envy_4500_printer_print_in_colorwjv1l.pdf
    • http://xogakijukutikep.22web.org/fusionner_des_adobe_acrobat_reader.pdf
    • https://pafufido.weebly.com/uploads/1/3/1/4/131407890/626397.pdf
    • https://bubinaxe.weebly.com/uploads/1/3/2/6/132681619/kelagiluxak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://givugiv.epizy.com/tiritamolekegemejaxuxu.pdf
    • http://vigukesege.epizy.com/bicycle_design_an_illustrated_history.pdf
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_1093ab21051c40e58d2e312d595abb0e.pdf?index=true
    • http://fofogagad.epizy.com/67122615664.pdf
    • http://sawelisibov.rf.gd/lowrance_hook_5_hdi_manual.pdf
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_153ba8c39cc44ef4a9728452ad9674b3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae9.bin
d72bf0b5f3f10688cb4c32fd7a04db05c97ebad579cb2e054903112bb36f5175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 5328 bytes
font_01_sfnt_off00010d21.bin
63fd51da6ed1b5478ed3fca0e9a6aa89ef425cd1caa07e0c5ee63d65c44c390e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 13632 bytes

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