Malicious PDF — malware analysis report

Static analysis result for SHA-256 990ab9f7b46c1835…

MALICIOUS

PDF

100.5 KB Created: 2021-04-20 09:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 71b7518093289d69ea8af3339363461f SHA-1: 81d34f0bd5131a993e4b0e348176176c68694308 SHA-256: 990ab9f7b46c1835bc210712cf7d0bb68804b31e59700612eafcebbc03751409
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=sta-rite+pool+heater+troubleshooting+codes PDF link annotation
    • https://cdn.sqhk.co/sojowidaz/lkXig4U/clockify_vs_toggl.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/wPUigha/zukedeta.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/fitunazifelikunijuru.pdfIn PDF document text
    • http://pubomotikevetu.22web.org/how_do_i_set_my_dvr_remotely_xfinity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_6028eae5b350a.pdfIn PDF document text
    • http://canlisohbetim.net/46444339062g51cy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_605b70b526e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/K9J9ehf/sacrifices_must_be_made_steam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_6014bbc3ef586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fcf98da2fe3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_6056fd4398954.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/jdjh3jj/zufefe.pdfIn PDF document text
    • http://luminar4-download.xyz/75096254199b6zle.pdfIn PDF document text
    • https://vifatogiso.weebly.com/uploads/1/3/4/3/134316440/6686596.pdfIn PDF document text
    • https://fizijoju.weebly.com/uploads/1/3/0/8/130814030/kuxawavotalaf.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/JEghnih/dixedubafota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijufebevavudep.rf.gd/zobewabiruma.pdfIn PDF document text
    • http://pakewerulawe.rf.gd/pokozajoderoge.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/sanewepelu.pdfIn PDF document text
    • http://deguwesipi.rf.gd/bewutuzi.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/49576210857.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_off00014765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14765 5608 bytes
SHA-256: b2de57309083d4c125e86039f9589bbd2361663f000cd922959cec1e9bf98cb5
font_01_sfnt_off00015a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6C 11968 bytes
SHA-256: 36458c7cde7cc5736f0ac3b582aa0d193ef2755d7ed929d4ec89b386c281a57f

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