Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d33159ac0b5c22f…

MALICIOUS

PDF

66.7 KB Created: 2020-12-24 04:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e518a2c1e7c9f57c2e11c9bfe29b0805 SHA-1: 1752160d9a7e54633442abe52fd51f135830acb6 SHA-256: 1d33159ac0b5c22f7a3d7da7ea32a28839175b7022439637232e1c87de640b9b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a significant number of external links. The presence of a PDF_SEO_LINK_FARM heuristic indicates an attempt to create a link farm, likely to redirect users to malicious sites or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and link farm suggest an intent to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=women+and+human+development PDF link annotation
    • https://cdn.sqhk.co/dupeguwova/pAhfwhb/pov_car_driving_mod_apk_rexdl.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/4171783.pdfIn PDF document text
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/9f8ab14c2bd.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/pugomonapoxuxe/bass_sheet_music_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20f0c66-65dc-4dcb-bd68-f7192220a2b0/lefafokumukesaseko.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/business_email_writing_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/add_text_to_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15a7c50-b7e6-4651-b593-067e207bcd31/xuguv.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/andhra_pradesh_census_2011_data.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/biology_science_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/73580457145.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/94987478909.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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 4996 bytes
SHA-256: bfe6d92c70c04695c1234c77d0f39bf8755667767816a591beaa2727273bbb65
font_01_sfnt_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 10700 bytes
SHA-256: 56c18c80605ebb56fbf8471f992f69422df91e5a0a703418d66404123722c767

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