Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f07b4385b5bb1a0…

MALICIOUS

PDF

83.2 KB Created: 2021-06-01 16:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e8a5c45ec0c23973fa6e4cd8ec2cb7e1 SHA-1: 9f5fa3ad708f7ddab5e50cc81e8eaa08ca3042d3 SHA-256: 9f07b4385b5bb1a05c2c626a579e19febb33f25ae15085ac1db3924917a382be
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to external sites, likely for credential harvesting or malware delivery.

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://synerhu.ru/pbw?utm_term=historias+cristianas+para+ni%25C3%25B1os+cortas+pdf PDF link annotation
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/kanepivawomubobetupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_603625df6ab3b.pdfIn PDF document text
    • https://sobapeseg.weebly.com/uploads/1/3/1/0/131070394/13ae122ab8591a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_6016dfac65154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_600c8ae544b78.pdfIn PDF document text
    • https://vorabatuzawudun.weebly.com/uploads/1/3/4/5/134582038/deleratakukelen.pdfIn PDF document text
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/nazuvu-bupikenomo-fatitabizap-vijadisus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_602ca95f99c19.pdfIn PDF document text
    • https://juwopumunas.weebly.com/uploads/1/3/4/0/134096214/tatokewubizapol-pirabupupixiz-bejofe-xuzidavik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fcbf71640981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fea3b43b66bd.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/ee2612052904.pdfIn PDF document text
    • https://vopixovusaf.weebly.com/uploads/1/3/4/8/134883771/8204049.pdfIn PDF document text
    • https://kejuzeke.weebly.com/uploads/1/3/4/4/134456394/597e4ab35e641.pdfIn PDF document text
    • https://mubagaluzab.weebly.com/uploads/1/3/4/8/134874300/0fb0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilanom.pbworks.com/f/how_to_cancel_brinks_security.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144466104/delta_math_answers_linear_equations.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/microscopio_optico_funcion_de_cada_una_de_sus_partes.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/f/zixubadikazavi.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144437310/truss_analysis_problems_and_solutions.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144431247/new_balance_md500v6_running_spike.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144423066/wugisixezenikowuvepevil.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/mxq_pro_4k_firmware_update_2019_download_free.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144423480/macbeth_act_4_scene_3_stylistic_devices.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_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 5292 bytes
SHA-256: c4a3d300b13a8818acc370e3bc3ee0e78c8c5c06a4fa5df4ae48b0ce4617b2c0
font_01_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 11944 bytes
SHA-256: 244f53e7d35927313a1b92508a9b561c71da01108c253af390e9c84c0a79e2b4