Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca2a43a25b59313…

MALICIOUS

PDF

87.8 KB Created: 2021-04-08 06:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 500e95f5ce21a4013f8c544772e434ec SHA-1: 82e62313116998d194d7c8bfc567b1d6a04abd57 SHA-256: 9ca2a43a25b59313ffc48152e20af3bb7f959f00921ab6a7d81db43e66003c1a
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 0.9993

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://seumenha.ru/wix?keyword=learning+to+see+pdf+free PDF link annotation
    • http://rollernefrit.xyz/93497921322g8fws.pdfIn PDF document text
    • http://mainsale.info/pogobeql3ko.pdfIn PDF document text
    • http://counterman.ru/heir_of_fire_audiobook_part_1bzb5w.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/fujedoxebejirotuxafi.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/41fe5773.pdfIn PDF document text
    • https://megevoweroke.weebly.com/uploads/1/3/5/3/135351245/rumatofu_narararivejuf_fesabol_nukup.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/5299339.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/jivuwutujoje.pdfIn PDF document text
    • http://fowarirodulanaz.iblogger.org/how_to_recover_your_body_from_soreness.pdfIn PDF document text
    • http://nawajojipiv.iblogger.org/satyanarayana_biochemistry_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepalekene.rf.gd/edenpure_gen2_air_purification_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/9067157348.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_5e3d14b2da0847bfac50ba95e872d903.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f12d8b8-095e-439b-ad38-2a57f1593b54/dns-323_firmware_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/vendor_compliance_checklist_template.pdfIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_a13e1fdd770e435a9d84410f78f64700.pdf?index=trueIn PDF document text
    • http://lilujajaka.epizy.com/39193993025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eecd537-c3db-4d19-9135-529930b9e056/50141018400.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_e9a2b0b3f3fa41efa44f89235c40b957.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1989da-9ab6-4bdb-bb43-08dff2530c99/fawarawulas.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/38859401300.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/54391274789.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_80543e86810d4578a7a7c62db9793868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb814618-c469-437d-b9a1-1125d838e531/how_to_update_atem_switcher.pdfIn PDF document text
    • http://jipuzekas.rf.gd/sign_up_sheet_google_docs_template.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_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 5116 bytes
SHA-256: 2faa4ff3a278e36b36574ea829defeff090bb474097d19a0f103e8754db46c1e
font_01_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 11524 bytes
SHA-256: 3c4a289cbf37da3dd2283cdc45a7903b816be710078d7983a3bfe85d2caac2dc