Malicious PDF — malware analysis report

Static analysis result for SHA-256 313298b75877720f…

MALICIOUS

PDF

82.1 KB Created: 2021-03-14 19:51:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: aee294afeb22491089242d891b55f40d SHA-1: f629fcb032442821852e6ffe1e75deeae6e53868 SHA-256: 313298b75877720ff778e25981c42ab987b2689e38532a21631ac7341f29daf8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a common tactic of luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=volume+pyramide+base+carr%25C3%25A9e+formule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378830/normal_6041360847d08.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/emotional_intelligence_test_for_teachers.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/kureberu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_600836e0185b3.pdfIn PDF document text
    • http://igafnd.org/toto_toilet_st743s_partstypwd.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/direjogolovefut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_602b4cb4c24c4.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/muruxat.pdfIn PDF document text
    • http://paselon.getenjoyment.net/kofudexefebekedujut.pdfIn PDF document text
    • http://decideyouself.fun/97944277868kpglw.pdfIn PDF document text
    • http://montana-media.com/30899902535u7nmh.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/36163252625.pdfIn PDF document text
    • http://kzrovk.xyz/minecraft_troll_maps_1.12.24fk04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_601252c54642b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ff1c478cddbd.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/spelling_bee_words_for_grade_8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofolimuri.myartsonline.com/kilewavojobafoledil.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_4bc93f26be5141518aadb690526fc854.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_cf7656761db449698a1ee2325978164e.pdf?index=trueIn PDF document text
    • http://romamosok.rf.gd/bangladesh_railway_application_form_2019.pdfIn PDF document text
    • http://nimunofat.epizy.com/ingredion_inc_annual_report.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_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 5652 bytes
SHA-256: 0d0d28390540cd0bb1ec1948aaffdd6f4b3250a5b385a2f3a5086ae7418fe920
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 13336 bytes
SHA-256: b0af4a82f73773adc54e72f2dc60f3c6ce41347f71360c07df320db2407c743c

Open this report in the interactive analyzer, or submit your own file for analysis.