Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc87a53120d75c2…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 08:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4924831954c764fe5cdee21fea00222c SHA-1: eba395e158afc174072fadf854a70fbbd097ff56 SHA-256: 4dc87a53120d75c2a442db23c2514ba73374125f6e7b096490c903d19157614c
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://resalured.ru/strik?utm_term=maths+riddles+with+answers PDF link annotation
    • http://tatuxuvoziparu.mywebcommunity.org/nerapito.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/5009164.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/gii5Mid/wheels_on_the_bus_melanie_martinez_lyrics_meaning.pdfIn PDF document text
    • https://nupafosudivoz.weebly.com/uploads/1/3/2/6/132682156/cae39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_601cb3dcbba21.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/30328229754.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/jbjUzQ1/pamerisikabiwopisumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_60257c8b03e2d.pdfIn PDF document text
    • http://penageli.getenjoyment.net/area_and_perimeter_of_square_and_rectangle_formula.pdfIn PDF document text
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/nagewokuvat-wegibimirozex.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/aijZjbE/tenobumijarusab.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/jegature_zunedaxobipewu_menix_jofikigazuren.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9043bcc-c1c0-49dc-8dba-ddf269c7a307/78805798783.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_fd133cd0287a46efafd7269f1ab957aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6af3c6-c834-4978-80ce-c67616100862/vomuzexefadetagaponoti.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_d80a45be70f2442dbf939f1661d464da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bc4976-fe63-4988-b8d6-9b4cebc0ecfa/75255699336.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

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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 5008 bytes
SHA-256: 68743e2c09f4a9a3dccc71b98f4098d23885107b3a3d38bff895b3b213e9cdfb
font_01_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 10932 bytes
SHA-256: fbd468f733240f4a3442b6ff92aea15509c4d629d668bd4b9486e6a5244d0c06

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