Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e89bbb1df2c70d1…

MALICIOUS

PDF

41.5 KB Created: 2020-11-09 03:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 73d2e2366e037cbbe708eef4a90b6b39 SHA-1: b2b0bace5e2011f5b3e8a213dd644792ab42eddd SHA-256: 7e89bbb1df2c70d13231346d42009ed51f6c7d2cb590258885b9fbf3b6321fe1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains or Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the primary function appears to be redirecting users to potentially harmful content hosted externally.

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://traffking.ru/123?keyword=types+of+reaction+worksheet+answer+key PDF link annotation
    • https://voletiga.weebly.com/uploads/1/3/4/5/134501602/ef528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_5f91e0a7c3c5d.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/kodutije_limoseked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f89d1dc8d5b9.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/849933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5f974d26138e7.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/govorikepudago-gixidawele-wawep-xoxebilepadevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f9b79e36207b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/lightroom_cracked_version_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/jacqulyn_elizabeth_hanley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239d5636-263b-4f8b-bfc2-afd31d144cb0/48576385810.pdfIn PDF document text
    • https://bebezabezite.files.wordpress.com/2020/11/guxeresuniwi.pdfIn PDF document text
    • https://xewavevu.files.wordpress.com/2020/11/55102498877.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_off00006256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6256 5280 bytes
SHA-256: ff12d6c5f736b3b71dcc2d36c141891dda0b71149ba6cee5bfd80c40d635dd83
font_01_sfnt_off0000745e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745E 11076 bytes
SHA-256: a65eb66b699ffc6b2ed755fab33e1828cefb0d9820d0d456282314c9310fd859

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