Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aa8c2abc9b6060…

MALICIOUS

PDF

110.5 KB Created: 2021-01-04 01:07:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b197251e832daf952652097faa8d5699 SHA-1: 9279db48aea77dacf3aba34101f42df51cd8acdd SHA-256: c7aa8c2abc9b6060d45a974bc81541c7a760a1f628b5f4c226d5db3b12ec7124
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content or phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://traffset.ru/123?utm_term=shinee+albums+and+songs PDF link annotation
    • https://pesonukakevu.weebly.com/uploads/1/3/4/8/134863065/tuwusezoruv.pdfIn PDF document text
    • https://xulisonifob.weebly.com/uploads/1/3/2/6/132695361/6697947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fc4ddd705ef9.pdfIn PDF document text
    • https://rizebilawi.weebly.com/uploads/1/3/0/8/130814716/2673075.pdfIn PDF document text
    • https://logukevagas.weebly.com/uploads/1/3/4/5/134507161/73c983fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5fd3022a1f2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fadfc198cdb1.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/RBeSPav/bali_umar_ko_salaam_hd_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5ff06a89bfb71.pdfIn PDF document text
    • https://derikuboxema.weebly.com/uploads/1/3/0/7/130776504/bidimipepeje-nixowuxigupuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/zalomi/american_commando_games_free_for_android.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 20124 bytes
SHA-256: 8542d75542e6fa2a651225852b7405841c7b0bf55ff391fcca0cedd7028c7688
font_01_sfnt_off00014e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E38 5388 bytes
SHA-256: 7341ae7b6fb036e859f8d607f5be199449d043c7e14a9d94cb6e028dd05493b5
font_02_sfnt_off00016056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16056 6296 bytes
SHA-256: 554f6a3b77d2cfba3f7ac636b8eaca6e6826a54bfe8462f7d8109b38da3c206d
font_03_sfnt_off000170ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170CA 11240 bytes
SHA-256: aa26b74b93e84871204076e6b260897b375cb874b2532d07ceb8ace63dd64141
font_04_sfnt_off0001973b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1973B 16096 bytes
SHA-256: b116d555496960b1001cf6c696eea8d4db69ac652c8811f9a70fd582a21e1c02

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