Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4b489a94e75fe0…

MALICIOUS

PDF

77.2 KB Created: 2021-04-01 22:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1c3b5947200f15b297287905abe7936a SHA-1: 5a9f9245bef299119e5e169f72d814d396ae101f SHA-256: ed4b489a94e75fe0667b834cac8ed69c5d66263756ff6dda1f0a46eb63cd81c6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/123?utm_term=cindy+crawford+workout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393034/normal_603ff1c45ac55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459318/normal_6055a72b72cd7.pdfIn PDF document text
    • http://xojitupozoded.22web.org/bioorganic_chemistry_and_drug_design_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_602360fb264c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fd8227c2984b.pdfIn PDF document text
    • http://gutemelav.22web.org/4218020970.pdfIn PDF document text
    • http://wemufonenirivor.22web.org/15609993278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_40eaec5f92d54b898b7e549079d9c079.pdf?index=trueIn PDF document text
    • http://toxalotivip.epizy.com/10960110562.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_1987dbf0bcdf4652817d50b7d0332acc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/xulagat.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_415b1ff935c644959797ba99b6add1c0.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_1f265bc5be544425b8a0c8cbd81701ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/18113488512.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_c093c7664b8d4255bbf1681b9a55d5e3.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_958dc8d835504ca4b036599d483bc70e.pdf?index=trueIn PDF document text
    • http://judedinem.epizy.com/kegunogotakab.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_c0eb2a4b2bd647bdad1e9c50e58c44ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/como_cancelar_spotify_premium_android.pdfIn PDF document text
    • http://mukovixajetunex.epizy.com/tavatadoxewoxiweledo.pdfIn PDF document text
    • https://78006a28-1a61-4a0c-a888-bd03506f561f.filesusr.com/ugd/3254bf_5f1e79e29f0a4a18b4b4a5afaea70b4b.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_724e0a9d0e0044e8ba40d972c31f1865.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 4968 bytes
SHA-256: 760eb2187e55edf8507eddac5c7bcaed01161fbfebe47337daed9ee8aa1603cf
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 11192 bytes
SHA-256: 25b492357877a4cce3140ea7ec23815ec595f833f0fb5245af1b6ff76562b38e