Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9c1293ca1df720…

MALICIOUS

PDF

76.9 KB Created: 2021-03-12 10:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1e18ed91395b496b89999e6ba11dcbd SHA-1: e5dc1c55e7950b11b921b9eb40449607b049e8b3 SHA-256: 1a9c1293ca1df72089acbfc8a3787a74c00bbe597c1a94e7d7c87034db4b3228
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The presence of a URL with a 'windows 10 free upgrade' term indicates a phishing or scam lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=windows+10+free+upgrade+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468286/normal_60199d92e18de.pdfIn PDF document text
    • https://larigagip.weebly.com/uploads/1/3/4/8/134887586/gaxigezagut_nuxuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_600074182ba5f.pdfIn PDF document text
    • http://vivoxasoro.22web.org/34929317437.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/148842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386605/normal_5fee7e59c1753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5fd64750c24da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_6017898066702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_602e99a2bb815.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/c03abe.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/zovorovaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_60463db15a311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_603d150f24e5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanaperuperamuw.rf.gd/navy_motorcycle_uniform_regulations.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/32860104846.pdfIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_be49c181189e47e28e5cf082681e5a8d.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_d9bbb7dcc09d445084ed9d29b1e3c23b.pdf?index=trueIn PDF document text
    • http://dabevejef.rf.gd/keurig_k_elite_c_costco_reviews.pdfIn PDF document text
    • http://pujumek.myartsonline.com/85423411564.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_d6b05adc98844eb49b62a2a3b19f83f4.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_d7bd30ef97a64b63a54d311d15649ffb.pdf?index=trueIn PDF document text
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_b0cd2e00417d4647aeaf89faac58997b.pdf?index=trueIn 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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5804 bytes
SHA-256: 9a8a857dae43be02729f20ec96bad4bbb08c454a996a160579945095fa98c980
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10700 bytes
SHA-256: f390f98a28036d98d3f8fad944cc5071745e61a048122a51f4c55ea50e7003ab