Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5cf33003bab9cd…

MALICIOUS

PDF

70.4 KB Created: 2020-12-28 06:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a88be172e55bd68814933a1cefe57e7b SHA-1: 99ff6af0d058b45c8bf105de80b8b9e3ab797caf SHA-256: cf5cf33003bab9cd054ff16850aabed5a5034b27a4f1519316ede2549589b2ac
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a mass external link farm, with one prominent URL pointing to a diversity visa lottery-related page. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://traffnew.ru/strik?utm_term=diversity+visa+lottery+2022+start+date PDF link annotation
    • https://cdn.sqhk.co/gujadozede/ijgdRqy/blaze_y_los_monster_machines_castellano_capitulos_completos.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/jbfjej3/tedof.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/VjVE8Ki/morirurumutile.pdfIn PDF document text
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/325173.pdfIn PDF document text
    • https://vemanilulo.weebly.com/uploads/1/3/4/3/134378365/bb0c5631523541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fbd999ab294b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5fbf29454dba2.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/bojafazes/98991837657.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/ralobimidoxijasagu.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/ge_range_jgb660sejss_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/spell_n_link_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/basics_of_cloud_computing.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/glossary_of_financial_terms_and_definitions.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/example_of_accomplishment_report_in_filipino.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_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 5252 bytes
SHA-256: 41a51a77b9e189c9cdb9e433efe1b2480b18a114bbdff29c5a09dda5fedabedf
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 12048 bytes
SHA-256: ea97bca82ab77285db226713f82f40258ee69c403de249acfb25d0937f2a9d0b

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