Malicious PDF — malware analysis report

Static analysis result for SHA-256 239af6a98a0b9581…

MALICIOUS

PDF

47.5 KB Created: 2020-11-05 20:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 48d3b550406058bcac78884da90c9668 SHA-1: 878f46e3ecc1ab5529a7bc3d1235de5683a64f6a SHA-256: 239af6a98a0b9581d0f7db79a0ca719531611fe7e7f84d985782620749d1d8c6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or SEO spam operation. One prominent URL, https://trafficel.ru/123?keyword=casio+dg-20+midi+guitar, is identified as a lure for a free-download phishing scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports 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://trafficel.ru/123?keyword=casio+dg-20+midi+guitar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f8a3116327b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_5fa217175dc5a.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/wexege-wotadumiwu-saxilesoxuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5f96128469a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f8a8b5df1e08.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/9702935.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/0e681705-05ae-4035-8c22-df8d071c85b4/que_es_una_composicin_escrita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ac5f26-769a-4571-9789-6c53f06e9962/zizupapanupafageraj.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/82059083681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da4151f-5751-47ab-a51b-ba75f5e1e13a/pefonakexejuxobiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff9bdff-31d1-474c-8e9b-724876465376/darkest_dungeon_shieldbreaker_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae9559f-b118-458b-99e7-177576b993b5/gujokepuvipa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7224/0798/files/47657414079.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/pimanasizegopumakef.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/71833996412.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 5

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_off00006a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A95 4836 bytes
SHA-256: 358713438b6f8152f34a8b9a6a18a9734fb18172b84b408f38c11797b7b505a6
font_01_sfnt_off00007b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B65 5324 bytes
SHA-256: 5da3f47134225fc33e5071ab634e9d6b3d273ad547da9b87397e7ad8005cdcda
font_02_sfnt_off00008d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D69 10408 bytes
SHA-256: 98c4f6db3dc4f12f05b7fc5d8b154f72f8dd2a852e9e39cbf5f361d636ebbbb8

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