Malicious PDF — malware analysis report

Static analysis result for SHA-256 960f3f479b55de7b…

MALICIOUS

PDF

77.8 KB Created: 2021-05-17 19:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c1d0e9416ae12100063f125284cc1951 SHA-1: 86dfd7b75451457a62b54ff632ea89f06961092f SHA-256: 960f3f479b55de7beee678af60f32b4a42d262ba497cb9694b5f35166d318cf4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards an attempt to redirect users to malicious content.

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://seumenha.ru/strik?utm_term=what+age+is+the+shining+book+appropriate+for PDF link annotation
    • http://zefutuwukeras.getenjoyment.net/kangaroo_mother_care.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/pedinanebakamezifobin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_603e7c2941db3.pdfIn PDF document text
    • http://retamos.mygamesonline.org/legadi.pdfIn PDF document text
    • https://zigibopujomez.weebly.com/uploads/1/3/5/3/135350997/sefeberefemi.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/tuxober.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/jixokedixanop-pupedezorifer-muzemomasax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_602da03d76162.pdfIn PDF document text
    • http://dwatches.site/28426688308fwnso.pdfIn PDF document text
    • http://xedijama.getenjoyment.net/37573753772.pdfIn PDF document text
    • http://vejuwetuk.mypressonline.com/20901021848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476954/normal_603c7b8255b10.pdfIn PDF document text
    • http://plsale.pro/booth_algorithm_for_multiplicationu81c0.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/bbc_compacta_class_11_english_solutions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5ff40c4c19832.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/fogibi/coliformes_fcaux_risques_pour_consommateur.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/nainital_hd_pic.pdfIn PDF document text
    • http://falariwupap.myartsonline.com/rekegekenas.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/asi_hablaba_zaratustra_resumen_por_capitulos.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/dibusitufakizudekunovotov.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/81731056857.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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5348 bytes
SHA-256: ae85fd63b6a2ca5b4cfa53a4547a0d631c9397e7c95ea84f69938eada53d6293
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 11032 bytes
SHA-256: 21a19b586e3dc1db5e842fce44dee1f0ba8162044eff953a670c893618d98eca

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