Malicious PDF — malware analysis report

Static analysis result for SHA-256 3874fea12bcf3ce2…

MALICIOUS

PDF

74.8 KB Created: 2021-01-26 13:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: fccb15018ffd9dec593433d61273078e SHA-1: e51f7d01c1a719d70d5a63b491a657e628b3162a SHA-256: 3874fea12bcf3ce2f96c98ca799529d7731fa41e69885d787f455008a8442a1d
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/wb?keyword=english%20background%20music%20mp3%20free%20download PDF link annotation
    • http://infokurs.design/jopujurugesixeribixaxalo6f6eo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff79c86cada3.pdfIn PDF document text
    • http://bettermoneytips.com/how_to_be_a_kindergarten_teacher_in_georgia9aqxl.pdfIn PDF document text
    • http://prizinsta24.site/bubble_spinner_3_gratuit9j6o1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_5fe6ae0a6ac94.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/6754515.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/ice_cream_cake_sweet_icy_desserts_online21x2x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5fdd6f43a7c02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fee67a851a81.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/dudurat/52316158009.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/70801890321.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/kivagijogololenorinoj.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/navujejatobexol.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/5014609772.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/tipos_de_aditivos_para_concreto.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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5984 bytes
SHA-256: 9a30fc6b3267f2474553ecc84b367cb629068b40a8124d133e1fed99a7a5c7c4
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 10976 bytes
SHA-256: bf831908ffa2e47b3b234507d7263b6daf28538af5aa33c1070b45a2914a905c