Malicious PDF — malware analysis report

Static analysis result for SHA-256 937a62bfe5765dca…

MALICIOUS

PDF

41.3 KB Created: 2020-11-07 02:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: aad53b5e15e3e51f2e4f8a3be499d41d SHA-1: 18f426d0e7ce286685c3133fe0567ca816dc9afb SHA-256: 937a62bfe5765dca1028e9fcb763b6b9f296771a585e424be8f0d628d9478523
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?keyword=advanced+download+manager+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f913385ef7b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f8e10c699be2.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/70b8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_5f8c73747ae14.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/dukajevo/17307060999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75e966ee-3681-44ff-b6f5-097eebb0b543/zudarilifowaloj.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/guxoxaxoxaxemesute.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/english_grammar_book_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/biddy_tarot_book.pdfIn PDF document text
    • https://wulitop.files.wordpress.com/2020/11/668025554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6944b87a-1d1f-4c58-bd3e-a5429c53a285/11842305584.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/yasin_suresi_arapa.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_off0000626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 5420 bytes
SHA-256: e81ebe64302e96b4ca50c33ac60b1f10a39bdfecddaa05694b23ee8672c7edcc
font_01_sfnt_off000074db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 10368 bytes
SHA-256: ecd0aa95c2151d1407fbafce554883c97e55b64dac84951d6ed52f8ed0c29ece