Malicious PDF — malware analysis report

Static analysis result for SHA-256 1781685daea1503b…

MALICIOUS

PDF

68.1 KB Created: 2021-02-19 14:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 70294e67a8b3dcfbdf556c654ff46b62 SHA-1: 2a743e6663429a913a2a47b74987b2996a44255b SHA-256: 1781685daea1503bd4fd399f71e03082b88f8ac2803928c8a49e302c50ef220c
216 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/wix?keyword=historia+de+la+iglesia+catolica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5fd82bf600d7e.pdfIn PDF document text
    • http://knitfqph.site/lapajanuvepajivofexets69lj.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/luvakiwatodekesapafe.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/68999524197.pdfIn PDF document text
    • http://jokidinavefo.22web.org/psalm_118_23_in_tamil.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/wajibile/emacs_helm_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/bully_ppsspp_android.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/balancing_math_equations_worksheet_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/85985908108.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/75400586930.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/dejivowop.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/77954077731.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/best_tv_sites_free.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_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 5068 bytes
SHA-256: 9d80e983dfc0a3ef0a1e77a4f2ef18dc10cf6d98e88be9149c1077a8d5fe1291
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 11000 bytes
SHA-256: 17030305cf5b8fa7a218010f9c9043718a91d3cb1046e6f6fa2960df4fb3ef1b