Malicious PDF — malware analysis report

Static analysis result for SHA-256 400df408c81382bf…

MALICIOUS

PDF

69.9 KB Created: 2021-02-13 12:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b683471efd84bfe2f31cd6f0e9f5a54d SHA-1: 4781dbefc584a76702f3ebc65050a1e58c5ab246 SHA-256: 400df408c81382bfc883348330f67a443a0e9e13c10ffb9d663c278db7af4fa7
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=soul+keeping+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368732/normal_600189320ff65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417321/normal_5fe298759c3e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367299/normal_5ff81b11416e2.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/kitaremu-luvadigub.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/sazixipame/wawijupodopoziv.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/95192733693.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/side_hustles_for_teachers_the_complete_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/tv_guide_tonight_toronto.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/aula_internacional_1_podrcznik_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/pimotususumafovivapawob.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/yahoo_mail_all_attachments_at_once.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/70003906955.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/85369250280.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/poliresazebuwoxepogofages.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/tesco_pet_insurance_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/51135398136.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/lake_of_the_ozarks_march_fishing_report.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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 4892 bytes
SHA-256: 437aceceac7e779391bcd86c316359aafad1fa19dcc27e1a23f3cd717a45732f
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 10296 bytes
SHA-256: 62437c416ced9ad4b88e2e3c16e11d076d690f18f6d045287b568d20be5c2d35

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