Malicious PDF — malware analysis report

Static analysis result for SHA-256 d442b25fa04bf615…

MALICIOUS

PDF

81.1 KB Created: 2021-03-18 11:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4a39b4062e91d1ae7384e6d395d30170 SHA-1: 51dcc8cadbd6c02cb43522b38076828bafec5059 SHA-256: d442b25fa04bf615697ad35c251334bad4d1917f9ce1879bf407d11e134fcb01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://resalured.ru/wix?keyword=clash+royale+private+server+apk+download+2020', indicates a lure related to game cheats. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/wix?keyword=clash+royale+private+server+apk+download+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5fd6a8b267bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_60149ee5e92c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_604c9d61205e3.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/rupatojuko/58317019291.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_a63045f4de354908a02e9f9a0c577c1c.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_6eb4a3b89b464ef3a38f7b03fcd624d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/97810239442.pdfIn PDF document text
    • http://kojusefum.rf.gd/98457479681.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/somuvivorepevamu.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/47385961752.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_18179e2f5337475cb40f4dabe5228ad8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/84853664948.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_7225dc5c88cc4d998aa703d955b02bb8.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_d7c9821e032f47ccab3ab4b40c9c7250.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/lunch_invitation_card_template_free.pdfIn PDF document text
    • http://wufizijutema.rf.gd/45271937810.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/41311231500.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_b63122defc7b4a7080f8a83e6bbb43ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/38504119953.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/juladirazenufazeviruva.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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 5544 bytes
SHA-256: 01fba248be32cb7a52abe0822f927ce5cb467c37f4016d3b70ba71743ea284de
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 15056 bytes
SHA-256: 4079a48fb2730bc396fb4555b0c2dde80424e5fd1b3a88c0156a891bf24654b9

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