Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cda201f358cc7a6…

MALICIOUS

PDF

38.4 KB Created: 2020-04-29 00:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: f02cee4c03ff940822b82ca77ab88fd9 SHA-1: 5be7ec644d28b05bfe99f4239cb113a09ad5d07f SHA-256: 7cda201f358cc7a607b3aa1d2ce7bee91c1c371e517aec1a779313622908915f
136 Risk Score

Malware Insights

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

This PDF document contains a mass of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly indicates maliciousness, and the PDF_RANDOM_URL_LINK heuristic further supports this by identifying algorithmically generated URLs. The document body, though partially corrupted, contains text related to an 'email template' and references wkhtmltopdf, indicating it was likely generated programmatically to host these links.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://jerealtyllc.com/uploads/1/3/0/6/130639976/130639976.html#introducing+email+template PDF link annotation
    • http://crafteroffun.com/uploads/1/3/0/8/130874053/7812690.pdfIn PDF document text
    • http://fitlifecouple.net/uploads/1/3/1/3/131379919/1205116.pdfIn PDF document text
    • http://childrensliteratureassembly.com/uploads/1/3/1/4/131407222/5214667.pdfIn PDF document text
    • http://jetcointel.com/uploads/1/3/0/6/130603760/925588.pdfIn PDF document text
    • http://magnoliastravelandtouradventures.com/uploads/1/3/0/6/130604931/4636f943f8294a.pdfIn PDF document text
    • http://ideasilluminated.com/uploads/1/3/1/4/131484395/61a9c.pdfIn PDF document text
    • http://spirithorsekingsburg.com/uploads/1/3/0/9/130969594/zalojedenosidomi.pdfIn PDF document text
    • http://barefootlaneclothing.com/uploads/1/3/0/4/130436096/225653.pdfIn PDF document text
    • http://martinreads.org/uploads/1/3/0/2/130289493/wavuluni.pdfIn PDF document text
    • http://kkstechtips.com/uploads/1/3/1/3/131380063/pefoji-sijoroloruseli.pdfIn PDF document text
    • http://bridalgownsinnh.com/uploads/1/3/0/4/130476396/letota.pdfIn PDF document text
    • http://narrowbandinghelp.com/uploads/1/3/0/4/130436172/kesozobizariko.pdfIn PDF document text
    • http://icremeria.com/uploads/1/3/0/4/130483673/lezadegeje_wosunojitomoma.pdfIn PDF document text
    • http://dunkhilldrygoods.com/uploads/1/3/0/2/130291579/rapugepofenarim.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE7 8288 bytes
SHA-256: 23f3d92ae26a76dadcf782feb8a6a79103b122799b6d97cfeec0a576c34f0e7c

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