Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9c1d1f1020bc72…

MALICIOUS

PDF

35.5 KB Created: 2020-05-23 02:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: b66112660b7fb1006614d205491d405d SHA-1: 1e74b8b421d58c9ee21480af48739da91b6e45e4 SHA-256: cf9c1d1f1020bc72a940cff9b1e03017882c02d85a67daf8d0b77261608dd5a4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO poisoning to drive traffic to malicious sites or to distribute malware. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://adsl-63-204-18-20.benefitplans.org/uploads/1/3/1/3/131398296/131398296.html#enfermera+en+apuros+pdf PDF link annotation
    • http://emerson.team/uploads/1/3/1/4/131408032/1965439.pdfIn PDF document text
    • http://gracecapeless.com/uploads/1/3/1/3/131384333/cbcdb1802e0f6.pdfIn PDF document text
    • http://mwkodenkan.pcamartialarts.com/uploads/1/3/0/7/130738918/wesukozupawexamajadi.pdfIn PDF document text
    • http://raw-designz.com/uploads/1/3/0/5/130539408/8187565.pdfIn PDF document text
    • http://artistsgivingbydesign.com/uploads/1/3/1/6/131606168/jeradod.pdfIn PDF document text
    • http://midlandfencepros.com/uploads/1/3/0/5/130588545/josopexa.pdfIn PDF document text
    • http://stfrancisxavier.org/uploads/1/3/0/6/130639600/finoneb-gafinekuwap-nukux-lotaruga.pdfIn PDF document text
    • http://equinoxequestrian.org/uploads/1/3/1/4/131454482/748476.pdfIn PDF document text
    • http://rogerwyattauction.com/uploads/1/3/0/5/130543740/pixogesomexifutaru.pdfIn PDF document text
    • http://webdisk.omahaseniorresourcegroup.com/uploads/1/3/0/8/130874478/mobutudivefegaf.pdfIn PDF document text
    • http://averybrown.org/uploads/1/3/1/6/131636929/5ec97b4d.pdfIn PDF document text
    • http://neoconcrete.net/uploads/1/3/0/5/130551176/651524.pdfIn PDF document text
    • http://dpapernow.com/uploads/1/3/0/8/130814083/56d462d24.pdfIn PDF document text
    • http://dawsonwallets.com/uploads/1/3/1/8/131871602/gosukuxo.pdfIn PDF document text
    • http://crabbyselectric.com/uploads/1/3/0/3/130379173/vezivaboweduxik.pdfIn PDF document text
    • http://webmail.valleycprpros.com/uploads/1/3/2/3/132302710/xiwuji.pdfIn PDF document text
    • http://whothefareyou.com/uploads/1/3/0/8/130814711/wovabew.pdfIn PDF document text
    • http://peaceacademycharter.com/uploads/1/3/0/5/130550729/f7809112eda.pdfIn PDF document text
    • http://luciocursi.com/uploads/1/3/1/6/131606047/vusudofu.pdfIn PDF document text
    • http://mwartistry.com/uploads/1/3/0/6/130604220/2ce95a.pdfIn PDF document text
    • http://eatfittravel.com/uploads/1/3/1/4/131437969/basid_wenepedozimo_nadekow.pdfIn PDF document text
    • http://laruelawoffice.com/uploads/1/3/1/4/131452827/57d6f27.pdfIn PDF document text
    • http://roseblhair.com/uploads/1/3/1/3/131380720/cbe1e9ce5e2a11.pdfIn PDF document text
    • http://koditpaperflex.com/uploads/1/3/0/9/130969065/dewaxufibisutunewu.pdfIn PDF document text
    • http://windfallchurch.org/uploads/1/3/1/3/131381658/mutata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD7 11672 bytes
SHA-256: 0aed7e972bac0bdd201c1886f15393f067908db0e84d8bb4eb91f71e2d913eb4

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