Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb88e27c97c71faf…

MALICIOUS

PDF

81.7 KB Created: 2021-02-25 13:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 1c5d9cc8fc2aa3a5a0299f59dcf6a1cd SHA-1: 52551616c1e4a044c3928900454aa3f2dd23febb SHA-256: bb88e27c97c71fafef346fbecc3eb558d3ec440d7948b76f7b5c8efa2f0cc423
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=public+administration+jobs+las+vegas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_5fe9d5fba2e39.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/5523103.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/vkifmge/free_classic_rock_ringtones_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_601ab5f625254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_601e514234a1f.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/PhjQ8ie/jikapokavamevemesubarimiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5ff7e7810a643.pdfIn PDF document text
    • https://vadidavulegisiw.weebly.com/uploads/1/3/4/7/134760242/gibatomekul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fee4e2f5cf5f.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/hhXTSjc/voltage_drop_calculator_wire_size.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/i8AbC4L/nail_art_designs_for_summer_holidays.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/jhvamjc/34993109312.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/8882512.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5ff65f27125fe.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/tesapibebujep/arquitectura_de_computadoras_alfaomega.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_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 5536 bytes
SHA-256: b997a0d90af2beb29b16301ab66266998dc8e2823627d28ab6448ec0d1c038ac
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11232 bytes
SHA-256: d393b6b291fcb14531cb8464ea5db4b3041a87bf6bdbe6e7b452a5ce6a91acc7