Malicious PDF — malware analysis report

Static analysis result for SHA-256 648d359665d4e22f…

MALICIOUS

PDF

93.2 KB Created: 2020-12-31 02:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e47cf9761de2566800bb4301a933c0ae SHA-1: 14cf4727de4af023a2165073d8d678cb654cb3fd SHA-256: 648d359665d4e22f880a9355300395523b9516ff47dadf4ce78b186f8d2b7b7c
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 link farm, suggesting a malicious intent to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs further supports the phishing and redirection attack pattern.

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
  • 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://trafficel.ru/123?utm_term=milli+q+advantage+a10+manual PDF link annotation
    • https://duxezixupedad.weebly.com/uploads/1/3/4/0/134095883/reritixalaroga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f926a449e135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f8a3de452972.pdfIn PDF document text
    • https://nulejekenafu.weebly.com/uploads/1/3/4/3/134367691/0fea5575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477863/normal_5fc145f0c80d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_5f91e160d29e2.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/0jbLgiR/7774633948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_5f9e2bbdd2446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f9271f149b3c.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/dapekufoxiraku/abbyy_transformer_plus_features.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/adobe_flash_player_11_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/47209323838.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/ultra_high_performance_liquid_chromatography_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/71584951174.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_off0001331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 5256 bytes
SHA-256: a951353e71fff21e3c93b4bbb1c43302e07981263653a5819796da124343c6a9
font_01_sfnt_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 10308 bytes
SHA-256: e55ec8eadb721d48f2264c323d1c837bbe367d177dd53d1fdf6c490138d01c5e

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