Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed129176249cfd5…

MALICIOUS

PDF

59.6 KB Created: 2020-04-13 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-15
MD5: c70be37c71cec27c4baabe685629127f SHA-1: 0ff1e7d2716b1ece9dcfa42af1ea67a271f0c2aa SHA-256: 4ed129176249cfd5d6d32720f75c41cb5cd3f2b5c5e896242c6ae4adc76d368e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or improve search engine ranking for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://tektruffles.com/uploads/1/3/1/3/131380973/131380973.html#cheikh+anta+diop+university+tuition PDF link annotation
    • http://hannahpipkinreading.com/uploads/1/3/1/4/131483318/214613.pdfIn PDF document text
    • http://laraslittlehatshop.com/uploads/1/3/0/2/130288643/8821608.pdfIn PDF document text
    • http://leanonmepropertiesinc.com/uploads/1/3/0/7/130740050/48af99bb.pdfIn PDF document text
    • http://professorquills.com/uploads/1/3/0/5/130589191/kebanudituveb.pdfIn PDF document text
    • http://hillel818.com/uploads/1/3/1/4/131407361/sesuxovakaz.pdfIn PDF document text
    • http://jvwritingv2.club/uploads/1/3/1/3/131383591/rezomafobi-safifufap.pdfIn PDF document text
    • http://riverbendbaptist.net/uploads/1/3/0/4/130476053/zebekif.pdfIn PDF document text
    • http://herohomeassist.com/uploads/1/3/0/8/130874403/a70340f45d57.pdfIn PDF document text
    • http://teachingsm.com/uploads/1/3/0/6/130620885/c6d9bf7613fe210.pdfIn PDF document text
    • http://erinkjoller.com/uploads/1/3/1/3/131398212/196cd2cdcf7.pdfIn PDF document text
    • http://cweventstaff.com/uploads/1/3/1/6/131606354/4824086.pdfIn PDF document text
    • http://nutritionbyzest.com/uploads/1/3/1/4/131483109/wepekunonuzibanuxake.pdfIn PDF document text
    • http://campk-9doggiedaycamp.com/uploads/1/3/0/2/130288571/29f6de.pdfIn PDF document text
    • http://rollingmetalauto.com/uploads/1/3/0/7/130775565/xenobe.pdfIn PDF document text
    • http://hairbyelliesiegert.com/uploads/1/3/0/6/130621132/vufisexalekugomugofe.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB9 9684 bytes
SHA-256: aeb0e0e4956f5e64b7c061e07dc149aa0bde1bd2dd8562670193b986742244d5
font_01_sfnt_off0000c319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 2648 bytes
SHA-256: 2c32c498f23db3cae400dac070c72b38d41a5d5dbe5041cbe08e7cee44e1acfd
font_02_sfnt_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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