Malicious PDF — malware analysis report

Static analysis result for SHA-256 5343c53fff4bddd9…

MALICIOUS

PDF

93.2 KB Created: 2021-03-14 16:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4564da0794ae60b35c9498917005aac2 SHA-1: 950600def664444e81bfeef0b6e39a34c246bf8d SHA-256: 5343c53fff4bddd97010a7e0892b1e5b43afad1ccb2eb717017225558bd62272
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+can+we+abolish+the+federal+reserve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fd7dadb9d4e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5fef5f62653ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473322/normal_60261e544a795.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/6176336438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_602732f006d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_601d8d853a73b.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/nogugusatinanej.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/9407593530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_5ffc970b382a2.pdfIn PDF document text
    • http://lavijowonuxogu.22web.org/7689674201.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_da886c463e47418cacdd7203eb57855a.pdf?index=trueIn PDF document text
    • http://livukuxuperum.epizy.com/rotizapofenuvifebuneke.pdfIn PDF document text
    • http://nononulavojiki.myartsonline.com/ct_file_bng_acrobat_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868a8005-e67b-442d-bec2-cfe30a51bfa2/41946100713.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_6577d071c704458db96aa0065f570441.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_122760c504544a2b8d4c114b10fbc311.pdf?index=trueIn PDF document text
    • http://fesebeta.rf.gd/put_out_phrasal_verb_meaning_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2921e495-3212-441c-80ce-2a63db9c84d1/12956204395.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_2204d95c57c44b2c8a90e3b91cbcfb1a.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 5360 bytes
SHA-256: 8e65446d10bd824c9a74a52f6a1891f399447ce7c6ebe814be171379475fc508
font_01_sfnt_off00013dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD6 12676 bytes
SHA-256: 96fd30b31da824c3060b89ce44801fdc645abdbc41eca96664623f0b6d697e2e

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