Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6761e4c9ebf2dcc…

MALICIOUS

PDF

73.0 KB Created: 2021-03-31 03:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4a87fcf1fe647decdae15cdf1d30e2db SHA-1: c994ed32b39e9c38015d03ce34914c9b5b395b42 SHA-256: e6761e4c9ebf2dcc8faafbaa546155bc0304b2ffd1711da26a362a13da201bfb
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 pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying a mass external PDF link farm. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=how+often+should+i+change+transmission+fluid+honda+fit PDF link annotation
    • http://jenewazajasazu.getenjoyment.net/gedusafonemejo.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/rikazupukowu-fevixumatudefo.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/liwokezuvuwudor-fabaken-pasuwujevu.pdfIn PDF document text
    • https://dobabolomibela.weebly.com/uploads/1/3/2/6/132681713/9385000.pdfIn PDF document text
    • https://masulawumesomok.weebly.com/uploads/1/3/4/7/134716226/gikelumosolid-dadadok.pdfIn PDF document text
    • https://zuzameponotu.weebly.com/uploads/1/3/1/6/131606203/nazovuru.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/dofepatadimuf_papupanizovol_defusidoko.pdfIn PDF document text
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/legaroga-baradizukid-xarodo-nuxad.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/vupave-jemuj-bikomatufet-bikoxalaner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/falufusu/capleton_albums_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62226494-1bd2-40f4-9116-9881cfd82094/black_male_hairstyles_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/lg_leon_4g_lte_case.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/batching_plant_safety.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/singer_heavy_duty_5523_sewing_machine_review.pdfIn PDF document text
    • http://kedekivotizera.epizy.com/diablo_2_median_xl_install_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/95912163398.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/jajob.pdfIn PDF document text
    • http://nufuwulevek.epizy.com/33061843432.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/bayesian_probability_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bb3386-bfbf-4e43-9964-a18ab3c9b824/1672888759.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/cherubim_and_seraphim_hymn_book.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_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 5488 bytes
SHA-256: c05822189703e2e6560b66e9010920762c4985257982828582cbf4453435eee9
font_01_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 9960 bytes
SHA-256: f665099565f2159dab7e1689cba4235a82ca6df6f38ae66214ae526431791183