Malicious PDF — malware analysis report

Static analysis result for SHA-256 c798e1517cf3d128…

MALICIOUS

PDF

79.2 KB Created: 2021-02-12 11:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 0abfd725eea0d445b02425eaf7db552f SHA-1: efb230651827bef863852a24f785cad4b85b80ec SHA-256: c798e1517cf3d1288bc6f65ded4d6f85585db9d544edd6f7433cc197a092bb9d
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/wix?keyword=samsung+ice+maker+service+bulletin+2019 PDF link annotation
    • https://dakilemuvepin.weebly.com/uploads/1/3/5/9/135963620/6360420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383929/normal_6004addb7f75d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fd142c43abed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_60151fb2f3003.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/fipaxixefu_vipofaxek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05b0527acf.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/e8e2d941bc43.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/dozuga/81157272437.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/49960604223.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/chamelephon_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/42763407877.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/vehicle_mechanical_inspection_report_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/dengue_guidelines_2017_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/17774640745.pdfIn PDF document text
    • http://bifezuragumizi.rf.gd/baby_formal_leather_shoe.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_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 5968 bytes
SHA-256: 3dc00168f48890bd886e5453146be3a6c10572d6f4f6620ef3452120759c11b6
font_01_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 10628 bytes
SHA-256: 0fdf85a4f6a3bd35fa1a5dbe0423540e30fd46d288bec705c90068a414bb113c