Malicious PDF — malware analysis report

Static analysis result for SHA-256 4147aff039c9e13f…

MALICIOUS

PDF

37.6 KB Created: 2020-11-07 07:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8eba7634871d660cc63c38fba51a06a5 SHA-1: 26c72a66073918d67985bb2a1466b1e3d3d994bb SHA-256: 4147aff039c9e13f8dfc4bfbe307435485bd9065f7e63c71f7668346d8a1813a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?keyword=homer+jr+high+school+homer+glen+il PDF link annotation
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/80fcb26db2b0f68.pdfIn PDF document text
    • https://givenuwijuzi.weebly.com/uploads/1/3/4/4/134445792/7813062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bokagav.files.wordpress.com/2020/11/adobe_photoshop_cc_2015_serial_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b85cd3-a61d-4be3-822b-c7491c62a5db/jetagefuvosule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8febf6ee-01cc-4495-ab65-607a78be2e50/61681644918.pdfIn PDF document text
    • https://gizaxem.files.wordpress.com/2020/11/27067336102.pdfIn PDF document text
    • https://jusumiwarem.files.wordpress.com/2020/11/toonami_live_stream.pdfIn PDF document text
    • https://jasobegofur.files.wordpress.com/2020/11/7843731627.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://bimokiwadodu.files.wordpress.com/2020/11/blinkist_apk_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f67ee2-a541-4aeb-aeb8-721d34e6e9d5/55624832741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cd854e-120f-40c1-8931-970e718793f9/dodalotewuxejuxopum.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_off00005257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5257 5040 bytes
SHA-256: 683c8593670fd0f75180cbd6fd8ec6e74ff60ad76b7638b567ebd8b763d126e7
font_01_sfnt_off0000635d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 11320 bytes
SHA-256: fdd5ebfd6958574428e65ec7d3d16a111029c4494c51483d9e0b324e81ab1f51

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