Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8dc6dd31b9fab23…

MALICIOUS

PDF

82.8 KB Created: 2021-04-03 23:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dd1053e4da0443b32e655fe76b7ae28c SHA-1: 9ae844e80c0e71a5acbaa967286f1fcfcce64be5 SHA-256: d8dc6dd31b9fab23d52a5619285fe78f1dc0089eb01359f2b32f8f94af46f89b
214 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The heuristic firings suggest this PDF is part of a link farm designed to host malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the critical heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/award?keyword=c%25C3%25A1ch+chuy%25E1%25BB%2583n+file+%25E1%25BA%25A3nh+pdf+sang+word In PDF document text
    • https://tugoxovelosiju.weebly.com/uploads/1/3/0/9/130969774/pufiwawupujuxuti.pdfIn PDF document text
    • http://poxamudowodet.22web.org/55130301559.pdfIn PDF document text
    • https://dokerawu.weebly.com/uploads/1/3/4/3/134313580/kudolejoked-fijabu.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/476847256.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/jonora/alto_saxophone_chromatic_scale.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_b046b685675740d9ba2a42896efcc4dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/mubewot.pdfIn PDF document text
    • http://ximuruguj.epizy.com/boundaries_dr_henry_cloud.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_0be1a78a4e3343b08d6cac64731c2b0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/is_midnight_sun_a_book_or_movie.pdfIn PDF document text
    • http://wefejaxofupun.rf.gd/muroriz.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/karuppasamy_song_masstamilan.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_2dd52c63c4b746eaa70ce6e676c939b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/81862923408.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/58123315985.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/moguzofala.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/lavuzoxebisolalob.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_6e789c1ba13b4d72a8e1b677228a9eb3.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_a5624313756b4fa291e21fbdc892242b.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_d473c46d0bc548d8a3e10eb5b4baae79.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_e640ef26fa6842f1b3972df3b9635fc4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/lijagisukijuwuximed.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_22b0b921b7d14e29a353ca98a413cb04.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_6cd735aee66041d0ac81bbe84650328b.pdf?index=trueIn 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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 6224 bytes
SHA-256: a1bdb127ce078b73b04224e733e813c6ec28af4593730d8dfbdde0bac824cb0d
font_01_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 22972 bytes
SHA-256: 47458c4fcde9bd35bad54d0400eefb09b6ffdfcbacde08f3c48b773255363e3e

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