Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc5c8a3185920f1…

MALICIOUS

PDF

66.7 KB Created: 2021-02-06 01:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 685185a78b1d0b05e94ec6e96ba2f5a9 SHA-1: 389e26d874793d655fc88b654e2c8caaaad12dec SHA-256: cdc5c8a3185920f1e9d18f3baa796c3ff489c72a6ff6ab1977d3a662386f97b1
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wb?keyword=vista%20higher%20learning%20d PDF link annotation
    • https://fobijolosa.weebly.com/uploads/1/3/4/7/134730704/157800.pdfIn PDF document text
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/tejefuxorad_jovomiwux.pdfIn PDF document text
    • http://kikudesazogug.22web.org/iifa_award_full_show_2017.pdfIn PDF document text
    • http://devicesprotectionforusers.site/34096752842qe9tw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418191/normal_60043051afc30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457272/normal_5fe2d0bb87081.pdfIn PDF document text
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/318d2d7e817b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369162/normal_5fc96ac71a0ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5fe997ab59eb4.pdfIn PDF document text
    • https://druttle.ru/wb?keyword=vista%20higher%20learning%20d'%20accord%202%20answersPDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degagaziv/57602076884.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/lamokomugawabimidox.pdfIn PDF document text
    • http://vujesidewu.rf.gd/joraxerib.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/repinokoradijikevimo.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/pakevefatomew.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/shareholder_agreement_format.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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 5424 bytes
SHA-256: 6cfcf7b67dd5d5795e4f71730140d1d8478a77d6c61cdaa2b8e4160fb501aee0
font_01_sfnt_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 10156 bytes
SHA-256: 5bde47c1ba8bbe677bbd5a9dc8e694aa79f2770bd3d77524f45d3604e0c26930