Malicious PDF — malware analysis report

Static analysis result for SHA-256 23003c62edf829f5…

MALICIOUS

PDF

41.0 KB Created: 2020-11-09 05:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f0993d7fa7b3ae7d7c836cc5bfcbc98f SHA-1: 1546fb4ddf1247e3028fd1be2003869edd105a01 SHA-256: 23003c62edf829f5fdd084d64f37af1417fcad34c8af60eeb2792a00ab2bd0d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to drive traffic. The primary URL, https://trafffe.ru/aws?keyword=download+gameboy+emulator+apk, indicates a lure for downloading software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://trafffe.ru/aws?keyword=download+gameboy+emulator+apk PDF link annotation
    • https://fobedixosofano.weebly.com/uploads/1/3/4/3/134377241/1181618.pdfIn PDF document text
    • https://vokobilozo.weebly.com/uploads/1/3/4/2/134235622/jovutid.pdfIn PDF document text
    • https://wenadexedodoren.weebly.com/uploads/1/3/4/3/134322255/6070704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jewepulin.files.wordpress.com/2020/11/46175573986.pdfIn PDF document text
    • https://desinijedugo.files.wordpress.com/2020/11/unnamed-file.pdfIn PDF document text
    • https://voditowusil.files.wordpress.com/2020/11/dapixetemitumuwusem.pdfIn PDF document text
    • https://kenevow.files.wordpress.com/2020/11/xetotofixumajodamexeme.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://sezikurovo.files.wordpress.com/2020/11/28782700017.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/53701883973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2535cd-13f1-4fd5-b4cb-d18053e81791/40754661495.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_off00005bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF5 5496 bytes
SHA-256: 41563c34810fe5a820d61829578e868a98bf428deed9bb62ac8470d25ffe78ec
font_01_sfnt_off00006eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAC 12604 bytes
SHA-256: d13b7248c3dbff7b8a90b8e1a0e8a9d816f758821ae21dd5717acdf6af2f8829

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