Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcde5646fa06de89…

MALICIOUS

PDF

72.3 KB Created: 2021-02-14 14:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 844801643fb3d175469c05c05152c116 SHA-1: 9b4605f799c9ea28444de0eef30c7d00e3700fdd SHA-256: dcde5646fa06de89fd93de9da922203d92e88d1ca3b6508063668b56011e32c6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to potentially malicious or unknown domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=ryobi+10+table+saw+review In PDF document text
    • http://mercelus.xyz/ejercicios_con_graficas_en_excel922yf.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/5208787.pdfIn PDF document text
    • http://czecheducation.space/peabody_picture_vocabulary_test_templatekgc41.pdfIn PDF document text
    • http://wevepizivato.22web.org/tobita.pdfIn PDF document text
    • http://kudretbozaci.com/pilot_royale_hackd7jij.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/vegejavome-pubakuwamojew-tuwimotof-gedewamajum.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/8580e6bd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijofabuzipa.rf.gd/aws_firehose_lambda_transform.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/microsoft_word_2010_formal_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/40_birthday_invites_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/nudokebuperafoderanili.pdfIn PDF document text
    • http://dikewovob.epizy.com/apc_ups_1000va_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/android_studio_gradle_path_variable.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/arizona_state_new_football_uniforms.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/rotetubi.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/oh_cecilia_the_vamps_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/duduravipuku.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 5276 bytes
SHA-256: 8541af2ef342111e8d3731fae6fb1817c362ccceccd495bdf4e5ce0450f41c08
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10380 bytes
SHA-256: f9e138d8612e02a17c6d73bf439c9fd37db52dc0e5df8f33d1bc512ba5b55e88

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