Malicious PDF — malware analysis report

Static analysis result for SHA-256 874d7c37ebd1aa33…

MALICIOUS

PDF

66.7 KB Created: 2021-02-28 04:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 22fc486dfc07066a71913e38853e0d01 SHA-1: dae1ea855aeb8d0edbebf52da8dfb9dd1476d7ea SHA-256: 874d7c37ebd1aa33faac791516a1e5fe5810a8881f4bd38fe7441665199d9a19
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=run+on+sentences+worksheet+%25232+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fdb02c4dd91a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_602b284931b22.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/bipivaninorobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373768/normal_5febb324ab625.pdfIn PDF document text
    • https://jeluvumo.weebly.com/uploads/1/3/4/4/134492882/8783452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_60218f18d4cd3.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/vazudinewoperok.pdfIn PDF document text
    • http://bezigex.iblogger.org/im_injection_administration_guidelines.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/mukemabagitada.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/wolosiwuniniwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_60356a930e1eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimekawuxa.epizy.com/mozabejusofejejo.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/calendar_template_for_goodnotes.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/64503275390.pdfIn PDF document text
    • http://munepej.rf.gd/86832022686.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/vekemimolatufopokilek.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/jajeguletaxef.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/addendum_template.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_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 4808 bytes
SHA-256: 18987acd3052d65a036c520466ecf994f487d980eb2d55e34a427015b608d5bb
font_01_sfnt_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 10188 bytes
SHA-256: 21e20376eb3e4ec26ced2a62df6688a0a1a530342fb268fb69f9eb723ab18bc5