Malicious PDF — malware analysis report

Static analysis result for SHA-256 035566fca80b0a26…

MALICIOUS

PDF

75.2 KB Created: 2021-05-26 07:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c32d3e1ce8714cd776f1bb1d89c380de SHA-1: 543f31f67cc0b1b033b77c5d5771d4598063e96c SHA-256: 035566fca80b0a2689417f522df9ec77068295bc1637961e1d56552b22e07d85
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm designed to distribute traffic or host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a common search query, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+does+f10+mean+on+my+kenmore+stove In PDF document text
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/5949234.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/nubipa.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/7286952.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/6460492.pdfIn PDF document text
    • https://rotaruwuzuk.weebly.com/uploads/1/3/4/3/134317315/3979e78744659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_604831da88ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_605cb0a644cb7.pdfIn PDF document text
    • https://sibomidejuxeda.weebly.com/uploads/1/3/4/5/134599986/5760291.pdfIn PDF document text
    • https://gopebuxagofu.weebly.com/uploads/1/3/2/6/132681698/7763509.pdfIn PDF document text
    • https://mubewawabover.weebly.com/uploads/1/3/4/4/134465459/cf6173437.pdfIn PDF document text
    • https://visoxifa.weebly.com/uploads/1/3/2/7/132740860/topebotimawer_kexapawu_pezur_lepedinal.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/nurebipof.pdfIn PDF document text
    • https://subolamamojoga.weebly.com/uploads/1/3/4/7/134719430/luter_fulazapax_rizujawosevak.pdfIn PDF document text
    • https://murezujal.weebly.com/uploads/1/3/5/3/135305344/4422598.pdfIn PDF document text
    • https://resowijex.weebly.com/uploads/1/3/4/6/134681832/b3f5af969cf288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad2a945-a3db-4fc9-9995-19dcfe8c9e2f/medios_de_comunicacin_oral_escrita_y_audiovisual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf32d9b-7d2d-44fb-b244-d149a35e95bb/jejekirakesinarituwesates.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/what_language_is_the_original_bible_in.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/74397265087.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/endless_frontier_raid_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c207506-0efc-4cae-a408-0cf10b3b53b7/jedukotaberosiriwemajevaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5d7b16-5f5f-4f6f-a9e6-71a1790775f7/why_is_my_rca_tablet_running_slow.pdfIn 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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 5548 bytes
SHA-256: 18be90765ea156caffae94cda997a6f796ae08197bfbe19e0e93fdb5c70f4f08
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10492 bytes
SHA-256: 9bdd524b441fd8e5cf7e25213edc9aadc817755bcc878410c369d602e34708bb