Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa351938e2464801…

MALICIOUS

PDF

85.5 KB Created: 2021-03-02 00:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ca3f3bdf2a189898943a6c87187118c4 SHA-1: b095810e011f4e88e81d49184dce2dadc598f562 SHA-256: aa351938e246480179dda214a83dea27f1d6f3b0eeb8a966be10a6ecb0e06589
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the ML classification suggest the PDF is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://baarspo.ru/strik?utm_term=shore+protection+structures+meaning PDF link annotation
    • http://jevufoduxixan.22web.org/loramuxogopolatokakol.pdfIn PDF document text
    • http://business-open.online/when_i_was_puerto_rican_summary_chapter_1mgr41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5fcb0ef9f2bef.pdfIn PDF document text
    • http://duzatizej.iblogger.org/chemguide_acyl_chloride_reactions.pdfIn PDF document text
    • http://winoraama.space/flammable_cabinet_regulationsdcd4g.pdfIn PDF document text
    • https://rerimewanuxo.weebly.com/uploads/1/3/6/0/136036548/3538737.pdfIn PDF document text
    • http://rejonanujezeke.22web.org/17629357204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_600742d062841.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/c611fa8fa26.pdfIn PDF document text
    • http://reduslim-eu.site/23197910038q6m8g.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/the_chrysalids_chapter_9_and_10_summary.pdfIn PDF document text
    • http://drilltech.info/dosuvoxegokitotewisebsi6n4.pdfIn PDF document text
    • https://fibexijenoka.weebly.com/uploads/1/3/2/6/132680926/bisegineliv_dupaki_pinuxitoxujaje.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/the_white_tiger_movie_netflix_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5feb03a5a6415.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/eb1ba7b888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fddba2fcefb2.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/9399295.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/xujurufibew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tafiwepamubov.atwebpages.com/dulizojafasolusiradunebe.pdfIn PDF document text
    • http://zosanugu.epizy.com/46958331042.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_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 5420 bytes
SHA-256: 932044ded4572377a26a2aa7bd27c092512fae529c749cb823eaf0a0199641c3
font_01_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 10400 bytes
SHA-256: 43f1711235e3aba80a4861423120531c9aceadb27e9b79432deafbf4b0bbe583

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