Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfead9e6181dbcd…

MALICIOUS

PDF

69.9 KB Created: 2020-11-17 15:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b16416b04b8a837f6bcc3ca6b4bbeb9e SHA-1: 16fe6544697e43b882eb8930d3f7c2d3a3d67ad5 SHA-256: 1cfead9e6181dbcd3a9c0d6e25d5a272a6be68d2b48ce69d6acee2c2a4c82961
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'peticiones para misa de ni os en adviento' and metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs. The presence of numerous links and the detection of malicious redirector infrastructure strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cctraff.ru/strik?utm_term=peticiones+para+misa+de+ni%2525C3%2525B1os+en+adviento In PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/pomabiverejifodetini.pdfIn PDF document text
    • https://lugeluwad.weebly.com/uploads/1/3/4/3/134328935/5633664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5f8ed1141f9ae.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/xakapudakadu/rig_veda_sanskrit_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/84126820060.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/92679178679.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/12372459556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f72b30-9215-4707-816b-5fdc85e3d15d/30997620703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8cee73-e2a4-4f45-ab00-ae2d0cb9d471/vegetation_of_humid_subtropical_climate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fb7dbf-daa4-4381-97f2-e4bfdae34aca/lunak.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/74272725998.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/gravity_falls_season_1_episode_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbaeb4a-8bb4-4fa9-a55e-1c3c3894ea5f/laberintos_para_secundaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6221720a-4dd6-495b-8f5e-2db68869c3be/xexuxevanuxezebis.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/bridges_cameron_funeral_home_sanford_nc.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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 5460 bytes
SHA-256: a6911f3c04868277b8410408f301ed1e79601e5288c2b9585751c314f0b5b240
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 11884 bytes
SHA-256: fbc925c6d1c1b6101ec4d9c00415b865c62db305ca88e10132afb55b2665b919

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