Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec16b031e514a340…

MALICIOUS

PDF

76.6 KB Created: 2021-03-09 06:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 19c13500916f27e5f607fcacdba991dc SHA-1: 0b6e6626656ba676ea9617d758c8034eafe7e2e9 SHA-256: ec16b031e514a340e024d6e111d4e744f8b954822bb278a8067789005843d4e8
186 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, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/wix?keyword=newcomer+et+al PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405946/normal_601c88fed4cbe.pdfIn PDF document text
    • https://satumumitexa.weebly.com/uploads/1/3/4/3/134347851/7f990e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fc8740f4a936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_60208f4a84cce.pdfIn PDF document text
    • http://vash-komfort5.ru/67426069956f2zex.pdfIn PDF document text
    • http://polnews.xyz/how_much_do_music_lawyers_makedze11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_6025ff5482444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_5fd844527f099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_603d8b0de3e5e.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/06f038.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/ibgiV1n/fresh_diced_tomatoes_calories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5fe41876aa827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420235/normal_60094e2ac141e.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/uiic9hh/xda_aa_mirror_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_60299c3457f9c.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/gelatedolaxamemekjfom.pdfIn PDF document text
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/rubalofusovumege.pdfIn PDF document text
    • http://spain50off.info/c_s_c_certificatelyq4m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fe49d66f3ad7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 4828 bytes
SHA-256: d3cd724497576be40b81f158101aad1ae3b98813c333ea9cb404d71d7780f6c0
font_02_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 10592 bytes
SHA-256: 783724ba9438c72f0194fc07584899a1e4acbefe96e9a142719f56c7de5b1bbd

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