Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7b805aaaff14e8…

MALICIOUS

PDF

97.8 KB Created: 2021-03-24 20:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 186cc2c9bd05bff077efaaf5d12ae69c SHA-1: 4ed13526f8d2d78f747d5fa055556f2e52779f4f SHA-256: 4b7b805aaaff14e8b7a2feff7edcc4e305d5591991d959f7e79d9ae3a68ebd35
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://vilenefex.ru/strik?utm_term=christian+pre+marriage+counseling+topics PDF link annotation
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/rumuba-roxepatugozere.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/sample_balance_sheet_format.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/4081918.pdfIn PDF document text
    • http://zolepop.mypressonline.com/nexuvijuwanezekabokijiwek.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/vutalidofaxetegadimupipu.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/zugegosak.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/23d01c62-f098-4d73-b6f9-ce99e5b0a5f2/10666247823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1230fc-5fc0-4db4-90bf-36b94692b987/how_to_use_a_vitamix_as_a_juicer.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/explain_how_to_use_the_standard_normal_table_to_find_the_probability.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_76667f40115d480cbf6a361e06f692ba.pdf?index=trueIn PDF document text
    • http://xasiruzate.rf.gd/autocad_commands_file_download.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_b3f9c7a44faf4506b4025b2e720f3b3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c456cbc2-49e7-4fd3-a1b6-105ffc30f384/soccer_drills_for_8-10_year_olds.pdfIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_d7a2e1c7f4d9411cae6470fff0fb8edf.pdf?index=trueIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/aafp_guidelines.pdfIn PDF document text
    • http://sosejuxosi.epizy.com/min_man_dog_tusen_gnger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bcd8b6c-00cc-4f2b-81d2-d7988e43d645/dayton_propane_gas_heaters.pdfIn PDF document text
    • http://jipuzekas.rf.gd/carya_cordiformis_uk.pdfIn PDF document text
    • http://mubuwinita.rf.gd/21834071852.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_51f361513a464fe0a192df50a8ce55c0.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_7f4943f014ad424e89dfc9be9c2f9ffc.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_off00014093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14093 5252 bytes
SHA-256: 22b230bae5a2ff0908ca1330c6c6e255ae5e54e9aa1a0dc1a8e4c9496da15551
font_01_sfnt_off0001523f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1523F 11648 bytes
SHA-256: 2618c954d3c118abcc7bd1f8af538740f86aa43d70e35d5d3fd1428db2806a30