Malicious PDF — malware analysis report

Static analysis result for SHA-256 4501e6db198dc4d8…

MALICIOUS

PDF

73.8 KB Created: 2021-05-11 00:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56f60b77a8b2842fa45dcd5b786fc9f8 SHA-1: ce9b081e1f1365f2982578ca73c9c52e63ae4553 SHA-256: 4501e6db198dc4d880eddd9c739e0c459fcbf9262d2d4bd060d465b66a38302c
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 0.9997

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://jottigo.ru/strik?utm_term=writing+chemistry+lab+reports+example PDF link annotation
    • http://reawont.online/modern_dead_release_datetqjj8.pdfIn PDF document text
    • https://dowevatubewud.weebly.com/uploads/1/3/4/9/134901186/xudizinupi.pdfIn PDF document text
    • https://nodudoweg.weebly.com/uploads/1/3/4/5/134599631/volobuguposufe.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/FrhgaUs/30247813565.pdfIn PDF document text
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/3b30b4e45.pdfIn PDF document text
    • http://tevfikyuce.xyz/13212900602rhbm4.pdfIn PDF document text
    • https://rujenamifib.weebly.com/uploads/1/3/4/6/134652207/nawisawenalafip.pdfIn PDF document text
    • https://suzitarux.weebly.com/uploads/1/3/4/6/134683800/dabavu-zafufu-xunirurodaxako.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/9938046.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/5744958.pdfIn PDF document text
    • https://vojanaxopij.weebly.com/uploads/1/3/1/4/131453451/bibunujo-litefef-xevilimani-tiwurakevakalem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_ae29f82bb813429186b5c47452ead81a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/happy_chocolate_day_images_free.pdfIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_11452925b2b1417d97ddfeacaf67579c.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_3ba09b6b75cd457fafbc839a7e5adead.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupuxus/uc_berkeley_public_parking_map.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/40482827188.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/program_definition_document_template.pdfIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_b23f1a05b08144b2883433ce9bb15e5a.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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 5672 bytes
SHA-256: 8322461df9c142b6a508950da70f92c0f671c736d291eb6fae24fad1f2b0de5d
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 10168 bytes
SHA-256: e232c88d9bfab0c4d1465e22ecf2b3823686f6af70f57e4b20b30d2e130db1d1

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