Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8781681023cc78a…

MALICIOUS

PDF

64.6 KB Created: 2020-11-25 17:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: fa8783da9a48aedf351be47ef6d5ca8a SHA-1: 37eac9e64eecd73690724bdb3335d60006e6bc3a SHA-256: f8781681023cc78ac53b5d97f68998753d2150ed37bf0c3eae61c6dd770a32f2
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://traffset.ru/wb?keyword=web%20development%20mcq%20questions%20and%20answers%20pdf PDF link annotation
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/4245505.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/2117856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8e185e34ff8.pdfIn PDF document text
    • https://gokododilu.weebly.com/uploads/1/3/4/5/134578034/sowikegi_tumetewiv_jovuveb_wegaj.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/midaguvimabof/77177995529.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/ninavorufuzopa.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/49039284086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a57c5a0-bde9-473b-a1fe-642ad93e163a/netabuja.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/89938009837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d8afda-4ed6-497e-8e9f-78f063fbf4d5/vovumaxisejosanewibo.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/49087960856.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_off0000bcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDC 5732 bytes
SHA-256: 2a54134cefbbdb2b43401036a3031fc3035d3207f0275b1fa2f66dc69361ba4f
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 11020 bytes
SHA-256: be133dae684dadd6ac13791dab7a5bfa8e5334ef009f4d6d0b7b41db00a18886

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