Malicious PDF — malware analysis report

Static analysis result for SHA-256 8696a5c36946a136…

MALICIOUS

PDF

73.8 KB Created: 2021-03-19 17:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3be06fa990f2e77e4e8baf27e6adcfd3 SHA-1: 178d88393ad1b1fef1e12a256e10ff3ae5628121 SHA-256: 8696a5c36946a13680d5914f2dd2f55c4ff32f9fe03021f19cfad80d99e6e065
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://resalured.ru/wix?keyword=accent+in+music+symbol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460682/normal_60313994d9cf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_60108e654f5f7.pdfIn PDF document text
    • https://jolevodib.weebly.com/uploads/1/3/1/6/131636654/bamobobok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461748/normal_5fdb74c24f351.pdfIn PDF document text
    • https://taresazafo.weebly.com/uploads/1/3/5/3/135335901/4198665.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/safafisapebopababa.pdfIn PDF document text
    • https://fizalexajoridul.weebly.com/uploads/1/3/4/6/134662396/5019556.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/ronavilinetes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467325/normal_5feb6ed0bfa82.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/bitumomelufezigi.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/25603872396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_604585053a75e.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/papujadunawatamek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373517/normal_5fc69cc8944da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_601298c1dd74e.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/77e0b988-c6c3-44e8-b849-3c477fc59a48/tabla_de_conversion_de_medidas_pulgadas_a_milimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e757cd2-ab82-4e63-bc12-fc812eeb54d0/61891209630.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/63344857781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c9b175-9565-4bbf-aff4-75b9faa60b5f/fagemuw.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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 4872 bytes
SHA-256: 029adc159464a45dd706b5d4c36438691641007b752e53a5a83a6344927ac3fd
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10428 bytes
SHA-256: 11869fe49bd844aeda83b175b3330973d1296036b30171215b3c8654bc32dd62

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