Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e31a4219d7b9dc…

MALICIOUS

PDF

95.4 KB Created: 2021-04-30 17:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab095049ea68f093b48e0639d241b9d0 SHA-1: 56d35bb56dd31cbb275b57d0e0c6f54d8dcc1ccd SHA-256: 05e31a4219d7b9dcc216a2b99990f8887631635ff1236f07d87688780b4a014b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9980

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=how+to+set+up+a+one+touch+ultra+2+meter PDF link annotation
    • http://fezibinuzot.iblogger.org/dovovirirubalale.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/78148695176.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/international_journal_of_business_strategy.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/zifuwaxulizagefi.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/rikijik.pdfIn PDF document text
    • http://fakixuvodiwiros.22web.org/36_questions_that_lead_to_love.pdfIn PDF document text
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/6711676.pdfIn PDF document text
    • https://terodovob.weebly.com/uploads/1/3/0/7/130776228/faboje-ximisezebajet.pdfIn PDF document text
    • http://mesovaronelabob.iblogger.org/interview_self_introduction_in_english.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/gonuxuduwafijiz.pdfIn PDF document text
    • https://vokavize.weebly.com/uploads/1/3/2/7/132710687/1847069d3141.pdfIn PDF document text
    • http://tewajaz.iblogger.org/english_literature_classics_top_100.pdfIn PDF document text
    • http://banoduber.iblogger.org/dezafowonikiserezipo.pdfIn PDF document text
    • http://kiwufaninini.22web.org/kelomogijuduwe.pdfIn PDF document text
    • http://jezugelevafebir.22web.org/banking_and_finance_terminology.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://padusij.onlinewebshop.net/lonisured.pdfIn PDF document text
    • http://bowedaliwerox.rf.gd/maulid_diba_full.pdfIn PDF document text
    • http://firuwasuwubo.epizy.com/chlamydia_treatment_guideline.pdfIn PDF document text
    • http://zotowivivakav.rf.gd/kujido.pdfIn PDF document text
    • http://fafozega.rf.gd/international_journal_of_mathematics.pdfIn PDF document text
    • http://degedudu.rf.gd/tadegopapujupil.pdfIn PDF document text
    • http://tatetutigu.rf.gd/78268650964.pdfIn PDF document text
    • http://parejibeve.epizy.com/interior_architecture_group_books.pdfIn PDF document text
    • http://wowijikozo.epizy.com/70930230735.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
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 5360 bytes
SHA-256: e21904e1d08b3ef9766432f8cbc7595b8efb5bf4dbadd7546e7987cd925cd9e2
font_01_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 21012 bytes
SHA-256: 7c8c6441be768cd37d23ca7cd548906e6c28b3c6b5e62ebba7a27cb17d8b815c
font_02_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 3532 bytes
SHA-256: 2a1a50dd8055f9c97a3bb6542645f9d0cbf2cda2b36a805eeb68fe6315230dcb
font_03_sfnt_off00014714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14714 11116 bytes
SHA-256: 11de2d68495e3fabc2969372606da06a38e9664b712e0edf2a2ea62489190b99