Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b75bb655ff57e3…

MALICIOUS

PDF

42.4 KB Created: 2020-11-07 06:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 32a3f5204ecd930159510b23ab3b5e9e SHA-1: cdb292eb659f009bcd3058972b7d16542febe797 SHA-256: f8b75bb655ff57e3f760f654d249cc07a614cd09b1654478da0f838a358e7f33
76 Risk Score

Malware Insights

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

The PDF file contains a lure related to a lease agreement, which is a common tactic for phishing. It embeds a link that redirects to the malicious URL 'https://traffnew.ru/123?keyword=simple+lease+agreement+new+york'. This URL is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?keyword=simple+lease+agreement+new+york PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420449/normal_5fa230f435d98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f870f8be090e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f9af62912bf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tazitox.files.wordpress.com/2020/11/36443193764.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/wasufawefumepibiwov.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/clash_royale_mods.pdfIn PDF document text
    • https://buvuwadozov.files.wordpress.com/2020/11/42969793533.pdfIn PDF document text
    • https://kufotukir.files.wordpress.com/2020/11/88562886637.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/17189477737.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/foritejixuwuzisamekatig.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/32721866479.pdfIn PDF document text
    • https://tojupeti.files.wordpress.com/2020/11/66863963803.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/lekozupemaje.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/words_for_smarter.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.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_off00006984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6984 5500 bytes
SHA-256: 1e5ee14e95164f2afc48bb953c34b8efd3ee032b8f7f1958f18f21a4e5835136
font_01_sfnt_off00007c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C36 9592 bytes
SHA-256: d069852d9a3ee8900b470e7a8d95fbc21c1a44d3763253d29ed38ea71aff03ec