Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b955599d6af782e…

MALICIOUS

PDF

79.9 KB Created: 2021-04-21 04:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26af544c3efb7f6126efc40678a05178 SHA-1: db971a4dc357267752bd36fd57dd54ac7afd017f SHA-256: 1b955599d6af782e75c42a2aab5373705e345a6b3803f556f3b4b547b0decde5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the links likely serving as a lure for phishing or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=pourquoi+la+rose+du+petit+prince+est+unique
    • http://pugezesiw.mygamesonline.org/how_much_is_it_to_lease_a_2020_honda_civic.pdf
    • http://wuteziben.iblogger.org/free_printable_1_8_inch_graph_paper.pdf
    • http://mipasotul.22web.org/cambridge_essential_english_dictionary_free_download.pdf
    • https://nipotowolexitav.weebly.com/uploads/1/3/4/6/134639117/soxepalokedozizemisa.pdf
    • https://wabexerimib.weebly.com/uploads/1/3/0/7/130739061/3943039.pdf
    • https://wesulabiduzipu.weebly.com/uploads/1/3/4/2/134235649/d5007.pdf
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/vokotavojanotanep.pdf
    • https://linebabeta.weebly.com/uploads/1/3/5/3/135317009/7601727.pdf
    • http://xenuven.22web.org/sesurirafesefamuju.pdf
    • http://takatoruwiseki.iblogger.org/sorting_algorithms_c.pdf
    • http://nuwetiveguvo.mypressonline.com/2720990981.pdf
    • https://zalozudipob.weebly.com/uploads/1/3/4/6/134673455/ruvivaletiso_jopesojit_wibisajefevu.pdf
    • http://botavubapisod.mywebcommunity.org/bamofefapopaga.pdf
    • https://zinaxavum.weebly.com/uploads/1/3/4/3/134354277/7368877.pdf
    • https://vakalebixop.weebly.com/uploads/1/3/5/3/135339933/706410.pdf
    • https://dewokazivefin.weebly.com/uploads/1/3/1/4/131437233/732a7426b060aab.pdf
    • http://merokomazojewi.scienceontheweb.net/zitadi.pdf
    • http://bimatixazokepox.22web.org/making_plural_nouns_worksheet.pdf
    • http://fegivate.medianewsonline.com/pdf_to_word_converter_software_free_download_filehippo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kirizuwapizu.rf.gd/fifezarosapi.pdf
    • http://repajazofuwide.epizy.com/kixewigakuvivinodasusaz.pdf
    • http://wedemato.rf.gd/bryce_canyon_national_park_trail_map.pdf
    • http://pakatikik.epizy.com/12333348645.pdf
    • http://lelogesisuzekat.rf.gd/antrenmanlarla_matematik_2_zmleri.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84d.bin
d715d7f6e80d51522432675fd97490e7bdd45ce2195b1e41affcc6f795636705		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 5196 bytes
font_01_sfnt_off00010a01.bin
ca50500eb67d0963f574505f4e08e656922ebbd4fe9f66695447cf6abde5893f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 12100 bytes

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