Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2dcc0d5c978d68…

MALICIOUS

PDF

41.5 KB Created: 2020-11-06 23:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 4692c0f0a224ebd719d48d37719d95cd SHA-1: 71513cf6323a05e92d1ced0b0401d8a2c9961123 SHA-256: da2dcc0d5c978d689464bbe45ef506b930b55e16597547e7e0f25392f69d21c1
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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/aws?keyword=tipos+de+investigacion+documental In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5fa12f5b601a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5f9c56b017e28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f96bd3c38611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413976/normal_5f9a44e9e24ab.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/rijaliwiguvex/classical_concert_review_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/keto_lifestyle_tips.pdfIn PDF document text
    • https://tefijum.files.wordpress.com/2020/11/melodia_silenciosa_mary_balogh_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/cedar_crest_high_school_football_schedule.pdfIn PDF document text
    • https://bibezebug.files.wordpress.com/2020/11/cambridge_ielts_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1e87ad-a889-4f10-9d0c-a357f100fcdb/fokapuwaposadanuxam.pdfIn PDF document text
    • https://dokilujaze.files.wordpress.com/2020/11/jaderejewav.pdfIn PDF document text
    • https://kujubadogil.files.wordpress.com/2020/11/borobilarusimobip.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/fgo_gudaguda_4_guide.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.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_off00005fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 5304 bytes
SHA-256: efcb66114e0f6b1d30452b65a4dbcde8685212166fac02eff8b50a5cb84a02f6
font_01_sfnt_off000071e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E8 11616 bytes
SHA-256: 2f539723532f0e98df4d751a0963255adc9ab2ffd015ede866b78eda533c1aef