Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c1f3c0551f6b00…

MALICIOUS

PDF

81.3 KB Created: 2021-04-10 15:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7658679467a0bc04be01ddb8a13c105f SHA-1: b08ccd50e14c4aa4f6d2766b51243ae2bb6eee3e SHA-256: d5c1f3c0551f6b00ac80f1c5ffc586659ba3dbf9f0436c4e8e9ffd4be9cb7a63
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, including one to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=allen+carr+stop+smoking+summary PDF link annotation
    • http://masuxuxu.iblogger.org/57000051505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fd60c9024671.pdfIn PDF document text
    • http://rivezetufizi.iblogger.org/70689137160.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/the_beggar_s_opera_gay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_6025f96177bb4.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/samamifuvuzerawofesuselu.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/relisu.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/el_alquimista_de_paulo_coelho_descargar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijudow/nilugerev.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_7d4d749144b7475990b91a4dec3a5b06.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_580138c58c7a4c93936c913854651545.pdf?index=trueIn PDF document text
    • http://kovusilo.epizy.com/responsive_3d_carousel_jquery_free.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/towexinolokifaxu.pdfIn PDF document text
    • http://rozesefotuduwef.epizy.com/budenuxamaxabumavenuravez.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/18260655099.pdfIn PDF document text
    • http://kipejefanowisu.atwebpages.com/b._pharm_syllabus_download.pdfIn PDF document text
    • http://fonobufusig.rf.gd/2019_ram_1500_bed_weight_capacity.pdfIn PDF document text
    • http://puxakuxuvon.epizy.com/93970372623.pdfIn PDF document text
    • http://semabuxof.rf.gd/sabegekapu.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/6834860438.pdfIn PDF document text
    • http://tuvufuxo.epizy.com/79449190770.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_off0000fd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 5408 bytes
SHA-256: 5b8b5d9335823f02dd9fdbbbbccc7baad9b94a7b42e04d5fab7144de0912ee14
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 11108 bytes
SHA-256: 545ec16173233fd60edaebd80fcfd05ac65981d0a0c591a5dee53affefda428a

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