Malicious PDF — malware analysis report

Static analysis result for SHA-256 4231a7bafbf86400…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 17:12:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01f79b5fdaf695f4e83997ef689ceec3 SHA-1: 57a65b0acee8b3b36be9f596ac59d469c8075e18 SHA-256: 4231a7bafbf86400eeeb5c350638beefe1f570be5ea60c9175a065b134968351
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though obfuscated, appears to be a lure related to a song download, which is a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/123?utm_term=salam+rocky+bhai+song++mp4 PDF link annotation
    • https://cdn.sqhk.co/disumuneriva/cPijOEt/64520506387.pdfIn PDF document text
    • http://vitodibiwanezej.mypressonline.com/pevijojagesejo.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/xurozogoz.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/keystone_rv_furnace_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/gstGIgi/2134445118.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/fukoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_3aa3c11036da4b6ea5aa9160380deeae.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_187787a874c6402490f414c8c67b3056.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_da73f73b00654287b3923c2d9c2d8147.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae9d905-e267-4005-baf3-e1a3de019cc6/first_aid_merit_badge_worksheet_2017_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e7fccc-6898-4e13-9551-28b954509cfe/burning_red_rash_on_legs.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_3896543d13214c78bce9645be9188365.pdf?index=trueIn PDF document text
    • https://c20404ee-77bb-4c92-9312-9c432827e291.filesusr.com/ugd/55f640_f54b4f59a61e4dd5bf7874827aa74cfb.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_cadd43268ab541059f08f7666b0511b6.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_e39b3d4df25a4d868ee610748499a854.pdf?index=trueIn PDF document text
    • https://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_683394cca1f74b9d819e3e1575f53c30.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_90185d89dd534736ad6d435609efc1a5.pdf?index=trueIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_d01ca0ba2c9d4644a6ca748256d5591d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2cf26a3-403f-4a23-9369-15c414dfb574/87678041964.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_2edbfd8d504f45c5a06c60629bece196.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd3da88-6b86-43c6-9da2-e2792097f247/sigedobid.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_751b007cdb204b5e9b9e17256b8a4557.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 5844 bytes
SHA-256: 76393ca6388d5bbe3fe59cfcbe3afa536b2be0de9b2624c96a60964ed01ce241
font_01_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 10384 bytes
SHA-256: 08f3df50a7a4ff7d6d870ec0a2f4925738ccc2a7afba2bb68123b1830eb38c10
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 18776 bytes
SHA-256: e58e8e8d3617fa2f52d62469859eb662c26c1c1537dc21f5cc6f1aa71eaa6aed

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