Malicious PDF — malware analysis report

Static analysis result for SHA-256 544cbd2cc696e22d…

MALICIOUS

PDF

72.0 KB Created: 2021-02-21 23:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: b4743ccb7b7df5380da3dd8fadcc0c21 SHA-1: 96815a958a86e954cde1ed56402839d0275e1617 SHA-256: 544cbd2cc696e22d71d7ba48c1c7518325345e6789cf1ea634d6c78bb58818cf
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://baarspo.ru/wix?keyword=patrick+keeler+london PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421612/normal_6027c99d44311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_60122f4f27e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_601cb7b25a6ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_60225bd597d10.pdfIn PDF document text
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/kikadamatak_gikegabow.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/tukevit.pdfIn PDF document text
    • https://sitadubudotewor.weebly.com/uploads/1/3/5/3/135335426/fukat.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/6654333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff50ad723021.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/pavujiniz/dutewenu.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/holistic_nursing_scope_and_standards_of_practice_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/72963779214.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/shirt_template_vector.pdfIn PDF document text
    • http://xitutudatiri.epizy.com/98465500881.pdfIn PDF document text
    • http://xuwunokebisul.rf.gd/58471512014.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/bully_bullworth_academy_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/base_adapter_method_in_android.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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 4820 bytes
SHA-256: f2a3f72efb5a52c130cf2ef22e0f3309148358b14b0520f466dadeb4ae8f429b
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10436 bytes
SHA-256: 0d09925d297a40ee3a893fdf747bb3096eac9a8ca3212b7a344b7e1c9d2177dd