Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3682f9482b58925…

MALICIOUS

PDF

83.3 KB Created: 2021-02-09 07:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a5ef0d3d953f2cdd47b363ceff7ab589 SHA-1: fa230920eaba0e44e7c64e61006ddf91b43fc361 SHA-256: d3682f9482b58925d7fe5bd13f8d3470cd787d4fb33b5a11f478e25eba6916e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. One of the embedded URLs, 'https://seumenha.ru/wb?keyword=c%C3%A0i%20android%209%20cho%20j7%20prime', is flagged as suspicious. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://seumenha.ru/wb?keyword=c%C3%A0i%20android%209%20cho%20j7%20prime PDF link annotation
    • http://gonzo-3d.com/gartner_report_2019_siem94x2t.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/fopujaposutonurefiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5feb42900e5dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5fddf76da1dca.pdfIn PDF document text
    • http://zvezdasevera.online/cute_puppies_for_adoption1dq7e.pdfIn PDF document text
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/pikipuvikiwebugap.pdfIn PDF document text
    • http://beststudent.space/58505154276joka2.pdfIn PDF document text
    • http://ranking-se.com/50368887969jx3ne.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/kubebelipozuw.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/1a2ce4375008ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_601cb34233d21.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/17a2be600f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_60210c19a6933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dixaleko/goldman_principles_of_clinical_electrocardiography.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/xakaxonebo.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/adhe_kangal_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/13550560941.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/71116743365.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/different_versions_of_android_and_their_features.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/little_drummer_boy_sheet_music_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 5380 bytes
SHA-256: a72732ffe69274d96daec82f0304f221d9e35df3455ab936fbcf067c18f16ce6
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 12592 bytes
SHA-256: 1311a7adbcfdb3aed526eea67ce18680a263b389e72b411b027f5534e7238607
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 16164 bytes
SHA-256: 6afcfcb4c2568fe5c4240c35a00cb7fe2d2ab6127327c4383cacfd2f10933b24
font_03_sfnt_off00012f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F90 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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