Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54fc7bc6b455df1…

MALICIOUS

PDF

73.9 KB Created: 2021-01-15 04:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b6850a625f68b33b943484fa37e9b403 SHA-1: 91e72a08c9cfdb631230f03e005eb2f83babc215 SHA-256: d54fc7bc6b455df157beb3f31edf0dbd79d874ab6834b70af7e0bbf8201682ff
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 hosted on disposable domains, suggesting a link farm or SEO spam campaign. The presence of a URL with 'how to get free fifa points 2020' in the document body indicates a lure to potentially malicious or scam websites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=how+to+get+free+fifa+points+2020 PDF link annotation
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/ganogenisuf.pdfIn PDF document text
    • https://site-1174961.mozfiles.com/files/1174961/titanic_movie_hd_wallpapers_for_mobile.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/9201448.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/roraxudekabir_vunelibigogu_letixukipav_lejirak.pdfIn PDF document text
    • https://xakezoram.weebly.com/uploads/1/3/4/4/134497816/403867.pdfIn PDF document text
    • https://site-1180826.mozfiles.com/files/1180826/vuregi.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/lezusunaxolisu-goroline-nomewe-gelemupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5ff8ca5663c84.pdfIn PDF document text
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/4c801934bc8.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/1f3412.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/edf4f9b802f27ca.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/sonutopexaramuf/example_essay_report_muet.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/79935930182.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/24772773093.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_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 5364 bytes
SHA-256: 48b955e8ce8edf750a86b198207c03391174d63de731ef6edfc71dce14e93830
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 10960 bytes
SHA-256: d6d5f9982da7a2e901f3c2c915f29dccb2f7ba671eb56a56a48b0f3331e865a0

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