Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d093db2565c462…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a474f096933ae6733f00d44c0e263252 SHA-1: 74f58f2c7971771f543cd137fcbc07bd443a9e1b SHA-256: 31d093db2565c462f33d78f5667ee52bc3a1766c615b4b4ad9d0cf5d881a3acc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=spirit+free+carry+on+size+2019 PDF link annotation
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/ba980c284be1.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/importance_of_being_earnest_summary_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499309/normal_5fdcad2a40ce3.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/cgjgdha/heroic_definition_francais.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/8373136.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/vagevuse-nizasediwovodi-kobif.pdfIn PDF document text
    • http://mimivudarevi.scienceontheweb.net/iv_cannulation_sites.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469101/normal_5fe56a01001cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_603a442025187.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/blpb6gg/patugowazokodagajosowog.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/dNGihH2/salivosed.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/b._a._m._s_syllabus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_5fe90a9c60512.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/jinghja/molajenal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5fe8c22842f58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_eef05385a9dd4dd19ee4543b87a01511.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_43cbf926bc3d4871a8f4f4d195c274ec.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_75d0a7e4399c44b0b96be68f2c68560f.pdf?index=trueIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/sales_and_marketing_resume_sample.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/28632171939.pdfIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_e3513c09a0b04a6da55f24d1c89dd226.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_67fe27ca75fd4b8ab271c0fbee923fdd.pdf?index=trueIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_9caef766c3214bcb9b9ae7019c43d025.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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 5716 bytes
SHA-256: b62f6b855ab5c8a0b6419072e89513be0fe06943420ef353b6e4deb9d37c0a87
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 11128 bytes
SHA-256: 5a1210fbf10de7f0003edaf6dd94a60a566ae5669d2ebb634f6629924c5a9d9a