Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a33ca4fa049ecd5…

MALICIOUS

PDF

62.3 KB Created: 2020-12-26 19:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1f6399fb56dc98e2ff1e7ad9e92e23f1 SHA-1: d27ce6fb2e450c8c830128698b857064b3583848 SHA-256: 7a33ca4fa049ecd545b370faac4cee785cd1eb19351dfba3932f608581b9b4a8
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=online+notify+app+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493579/normal_5fb773462c2e0.pdfIn PDF document text
    • https://cdn.sqhk.co/zenujulikik/AfZjadl/donoboxuwudanele.pdfIn PDF document text
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/punigowozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_5fd0bf4577f0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fd08e85781bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f8ff2a2ed261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5faf9bebbd08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fb56b5b659c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fa2448fd056d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5fbf37e080d9c.pdfIn PDF document text
    • https://bewosugug.weebly.com/uploads/1/3/0/8/130814774/382870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5f95a49cea509.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1180fc9c-f217-4139-8f9c-b951d79ca038/9579072100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc4d586-6fc7-471d-8bb0-1b62b8f319bd/bloody_harry_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/wotuki.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_off0000bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 4984 bytes
SHA-256: 4937aae0584f013c8ee998fcb8498bd106bb7daffed4dca760cb534253221204
font_01_sfnt_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 9400 bytes
SHA-256: 93b1fd0951654ef54d61dc8ea4cd057ebffcd5999970c079f197b1783bb772ee