Malicious PDF — malware analysis report

Static analysis result for SHA-256 6877e4d3180480f9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-20 15:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3e6efc90525594791e53580eb79900ff SHA-1: e7019d3e2306c555623fa6c4e85b6f8973c612f0 SHA-256: 6877e4d3180480f93544d830123d30ce632cc54ca5e740c0c7d0dabd511edac8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://soxebez.ru/strik?utm_term=what+size+tires+are+on+a+2012+dodge+charger PDF link annotation
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/4830364.pdfIn PDF document text
    • https://xukovefekafevut.weebly.com/uploads/1/3/0/9/130969731/natuborepa_mewaku_sexuxifex_zamof.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/genero_literario_narrativo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_6005c83eac908.pdfIn PDF document text
    • https://poroxokinawutaj.weebly.com/uploads/1/3/4/5/134507376/9143594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_603e37a3b86d6.pdfIn PDF document text
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/a06f478a281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5ff46999c66d1.pdfIn PDF document text
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/fikogobunezisuzemade.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/kiwilef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_6031013af3e41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5fc710f4bf5b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_3bebb255361341f8843ed58f1252fe95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c15b6c2-1f94-4c57-88c2-fe770e54884d/what_is_descriptive_academic_writing.pdfIn PDF document text
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_c4f651c4d66f48a089c10c3bcffd19a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2017af84-f7a6-4486-8862-715bc810dd94/who_is_the_real_life_wolf_of_wall_street.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d980e84d-ba03-4ded-bd61-cc795fd7c225/34974290779.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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5556 bytes
SHA-256: 24ed7393d0f0e5808f760d4bf92fbc563100928d94c85d004cb6ccc9c91e74b0
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 11080 bytes
SHA-256: 2363e25ec834777089ff089d09542a9deb5c1bc90bebbb01b97e7eb3f867f129

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