Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d5626362573412…

MALICIOUS

PDF

38.5 KB Created: 2020-11-07 07:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8df8bf72c6b91bdb9fe293ca94d42d62 SHA-1: 9579b911b46063398ec02640339860147f400894 SHA-256: 98d5626362573412336f16ffbbe1b5c98f69d3d53b39504aaf9b82f837673083
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 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 https://trafficel.ru/aws?keyword=words+that+start+with+an+s+and+end+with+a+c PDF link annotation
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/buzukiwobu_mekisojedaro.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_5f9c7592cbaa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d52eb4-b66d-4abb-b64d-5da0e31a782c/bazuxejabesabipida.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/tuvewidamogu.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/7397353107.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/hernia_inguinal_recem_nascido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ec71e2-51e5-4cd9-b6bc-82665635ee82/74495666044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299fdfc5-ad7e-4a9c-96d4-3a1ace40f6a9/71138655566.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/jubuzekopozemilasufobi.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_off000054e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54E7 5100 bytes
SHA-256: 87fc3227073d178ecc875742f3ccd3c30be2f1af16cd4bbc60a053ae697f9fb9
font_01_sfnt_off0000664f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664F 11808 bytes
SHA-256: 802b556dc16a2c8f8af6a84de1e169c285b684482b1235f9dd49b876b3c19e1c