Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b7ca573b40567a…

MALICIOUS

PDF

72.8 KB Created: 2021-02-03 17:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: afbb3124301666a60199fd10ad8ad384 SHA-1: 45ee8902186c20f478d120c4e39640f6a48cea9c SHA-256: 54b7ca573b40567ac49f6422e6cc5c5bf95c9d6429bcc359bbf891cc2253d8f0
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=nut+bolt+size+calculation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409250/normal_5fd68a62d114a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fda76d64300f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6015bd5276130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_601a622d5609f.pdfIn PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/8079107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_5fd7d6a0ada0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_5fdc7955d50ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_6016494245314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fee46d879749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366029/normal_60024a1859255.pdfIn PDF document text
    • https://wusatotaluvak.weebly.com/uploads/1/3/4/4/134469206/roxadotax_lagogubep_zitiramoguvub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_600fdad9e4d67.pdfIn PDF document text
    • https://gudabujazoz.weebly.com/uploads/1/3/0/7/130739385/zesegewetomifedik.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/bokexizometun/58712088584.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/azhage_azhage_tamil_album_audio_song.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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 4856 bytes
SHA-256: 0e6a7c1fe59845c2709aac65fb0537cd229ae6a983a3dc2c285c22bd3651924f
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10664 bytes
SHA-256: 23acbb8b79556b2833466140c8bda0b7725279d1c22ac6327805a32584ac3037