Malicious PDF — malware analysis report

Static analysis result for SHA-256 613ffe50db3cd603…

MALICIOUS

PDF

68.3 KB Created: 2021-02-24 04:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: fe29def85c2a28ce715c420909f558b6 SHA-1: 281d1e32742ea7e82971fa2be07a6986038956d9 SHA-256: 613ffe50db3cd60373597d51bf9dc597f1c858c4eefc6f0e159d48cd49152d3f
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/wix?keyword=unit+sadlier+answer+key+level+d PDF link annotation
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/nijerabat-medaguwuwip-mavajovevo-gidixowuniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_601b509baf4b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_600f582595091.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/4386131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_60286974b5b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_6028b92fea3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_5fd8ba7aa5048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_60179bc6ecc1b.pdfIn PDF document text
    • https://zuxogujuwikowe.weebly.com/uploads/1/3/0/9/130969390/8e237a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5fd2ebb8d1814.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/dezajok/bifesta_makeup_remover_sheet_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/microsoft_365_licensing_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/broadsheet_sydney_restaurants.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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 5128 bytes
SHA-256: 83bc03a4a207f61ef52cf1ee6842fba44114ee5b72640f74582e6b9c07d862db
font_01_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 9800 bytes
SHA-256: 7653030a566a9a07ea181a162d39acb61b049769d0c626c91f4d0721c4547e92