Malicious PDF — malware analysis report

Static analysis result for SHA-256 6669ce0fe914d662…

MALICIOUS

PDF

42.9 KB Created: 2020-11-06 15:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 51ae9385098b7a572d5a07e2096442e1 SHA-1: eb6f667368d6fefd1dde347be4f52372249d8725 SHA-256: 6669ce0fe914d6628f88a387096d7a893ede4b82a86442f1f54914a295b917f0
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many of which point to a redirector URL associated with SEO spam and phishing lures. The document body, though partially corrupted, includes text related to a 'manual water well pump for sale', suggesting a deceptive sales pretext. The presence of multiple PDF link farms and a high ML classifier score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?keyword=manual+water+well+pump+for+sale PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e91d14d-75e1-4307-989c-36c42aa94fed/zefisuvub.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/tehachapi_high_school_bell_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/45899372917.pdfIn PDF document text
    • https://zisaniv.files.wordpress.com/2020/11/38506493434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410afc05-4114-4366-bd8f-ba1a0bf61664/42317421567.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/xafuwonamolemebixopanisiw.pdfIn PDF document text
    • https://vorigiputop.files.wordpress.com/2020/11/tojinodudivunaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7308b899-376c-4e21-abd9-4b78faa05035/molanedafizubupibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cbd04a-a1c4-4ed4-b80f-6c3c7c73a0f7/gudekesedeseki.pdfIn PDF document text
    • https://dufakeribeze.files.wordpress.com/2020/11/20778825530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bade7c6f-c565-4384-a569-812e07f860df/77387790690.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/greek_goddess_snake_hair.pdfIn PDF document text
    • https://nijubar.files.wordpress.com/2020/11/xivaminajodefaxoxuzazig.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4E 5144 bytes
SHA-256: 00651a7cb3514a4ddf457d83244c69101c9e0d2fb25d8c87d5846b9390e28918
font_01_sfnt_off00007bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDB 10328 bytes
SHA-256: 41fa1ae96ed9114171d0e6cd239b76d31d463fb9e08618035684829a4faab96f

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