Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cf159edc72f3b7…

MALICIOUS

PDF

85.3 KB Created: 2021-02-15 05:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1199d5879f11cbf2251157f5b1b8e679 SHA-1: 326897e706ec21920cec0f6025f6304e33040bcc SHA-256: 33cf159edc72f3b76651621c9ec45117014b2d068e7e57efafcc0fd1f1913998
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://jottigo.ru/123?utm_term=grip+leadership+conference+2020+perth PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffeb60a25dd0.pdfIn PDF document text
    • https://tupumerar.weebly.com/uploads/1/3/2/6/132695397/3462703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_6007205948ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_601093a7341dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_601419af1c2a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374189/normal_5fdf29150d9d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_6023aada01f5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5ffd551dc5155.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/0IgjPk3/22005600208.pdfIn PDF document text
    • https://kopujigok.weebly.com/uploads/1/3/4/8/134862339/38cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_5fd31a51322cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5ffa693ef04fd.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/golepe/acc_guidelines_ascending_aortic_aneurysm.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/hirsutism_guidelines_endocrine_society.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/luzugolewugisoju.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_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 5548 bytes
SHA-256: f76f84fada77ca1f1a38fb462445b69fd0d67e299c6f17f78d21aba621f22560
font_01_sfnt_off0001248a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248A 10596 bytes
SHA-256: 4554797f4105b9b6ef18bfc18acb2fd08b3d3e69bbc40d07504a613f308f1651