Malicious PDF — malware analysis report

Static analysis result for SHA-256 257d16b79f397b83…

MALICIOUS

PDF

65.7 KB Created: 2020-12-26 03:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1b7efb75a033d3d24421d576d965e111 SHA-1: 7e4efeb0f7cd8f6eaa075e46b7832f7909ff7183 SHA-256: 257d16b79f397b83b7b06ba00bfe601c56a0648d74b9480d2ad1a8d1a1ed3465
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through various external links.

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://traffmen.ru/123?utm_term=les+giblin+pdf+indonesia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_5fa62a008f92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5faafc562e6f3.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/fafinativesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_5f994864c0bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_5fad683416636.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/fiibjhD/4243458374.pdfIn PDF document text
    • https://kijadixuzot.weebly.com/uploads/1/3/4/5/134585523/milaxemarab-wuvuzitav-fegatigaziteweb-sulefogow.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/tinajabizoreguf/dryer_sheets_inside_shoes.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/apk_mod_menu_games.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/59584633953.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/dunkirk_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/tv_guide_cairns_sunday.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/zuvanikedisakubowejuwug.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/daderawukusubopawadawobov.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/anesthesia_secrets_5th_edition.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_off0000c531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC531 5196 bytes
SHA-256: f19a352654149c154b4a2d9656cb8aae67930f8da4463e8cc170b7a5d9cbb50d
font_01_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 10384 bytes
SHA-256: 6f9603fede4a6545a136256f1864011920bb13bfb011f9a8704b37922ac40637

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