Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae652df41a31a945…

MALICIOUS

PDF

78.0 KB Created: 2021-04-09 06:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1a269d9d7c3008dc70554c4ab43b8a87 SHA-1: 5648c3656f55c752305f0bc40286de786b9ec67f SHA-256: ae652df41a31a9459ca8857c784dbedee5492e7934116952564353e3f3632e5c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to redirect users to malicious JavaScript or exploit-laden documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=how+to+make+your+own+target+stand PDF link annotation
    • http://regvoolkim.website/mod_among_us_always_imposter_androidkdcqw.pdfIn PDF document text
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/2649852.pdfIn PDF document text
    • http://app-3null.com/90558787589tign9.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/jJ9W0ha/gugimibu.pdfIn PDF document text
    • http://vipmanmarket.space/good_saint_bernard_namest2ynm.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/SEMjiW6/41289724863.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/pitosexabel.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/gfYaigV/34932214590.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/BIjfKhd/pawegixakewolazudolobor.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/b9cc25ff28279.pdfIn PDF document text
    • https://fogenidu.weebly.com/uploads/1/3/4/3/134391000/xigitoluxozeligexe.pdfIn PDF document text
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/bagularodoxu_xufazobozuvubom.pdfIn PDF document text
    • http://kvyovk.xyz/kefesonevortoi72.pdfIn PDF document text
    • https://zoxalutaj.weebly.com/uploads/1/3/1/4/131407742/3803002.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/kokedosufubekap-posefor-sezifo-pupuja.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/ef69126b31a8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_ef210bd0460046129bef0dc1879350ac.pdf?index=trueIn PDF document text
    • http://gedorigakijalag.epizy.com/34102010315.pdfIn PDF document text
    • http://maligufaribez.epizy.com/xibemibozoxat.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_293b49bc8ffb4d6584fd0036caff635a.pdf?index=trueIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_995d3197851240e68184353dddd6e617.pdf?index=trueIn PDF document text
    • http://kepelagivon.rf.gd/como_usar_las_varillas_de_radiestesia.pdfIn PDF document text
    • http://losikamadan.epizy.com/imperialismo_norte_americano.pdfIn PDF document text
    • http://paritoxo.rf.gd/softest_breathable_bed_sheets.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_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 5332 bytes
SHA-256: fbd8f9bbeaeb9f9431d92a11790a9aa7cf89db3ccff6dc466a425303e755a790
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 11296 bytes
SHA-256: 5dbd870e694d31c433c3836f04f357666c94a9b80698d8dfbcc6965b500a20af