Malicious PDF — malware analysis report

Static analysis result for SHA-256 1915ad29db6a5ac9…

MALICIOUS

PDF

77.5 KB Created: 2021-05-27 15:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1b01cf159a4ba29954ecd6610230ce0 SHA-1: 72c7a2a423a1563d41da3fae8dfdbd2b12d09aa0 SHA-256: 1915ad29db6a5ac9749447468104782817ffd0acba593322bc993935862463c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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://maypoin.ru/strik?utm_term=samsung+bd-jm57c+wont+turn+on PDF link annotation
    • https://kotasixunepa.weebly.com/uploads/1/3/0/7/130776076/6396601.pdfIn PDF document text
    • https://warubeduzubam.weebly.com/uploads/1/3/5/2/135298611/xonalaxisowavas-guteratepejow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fc8c241c62c6.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/336eb429e94ec02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_600b2d76e2e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_6028169bdcacf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_6035624e20111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_603410607f200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6021169641f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6068714ee28ed.pdfIn PDF document text
    • https://pururejipe.weebly.com/uploads/1/3/4/2/134265449/7460315.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/464ffae8a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_6000909001c40.pdfIn PDF document text
    • https://pagiwidew.weebly.com/uploads/1/3/4/4/134498508/zakowezatarolo_wujeresutis_torewirojipoje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5fc69f550eeca.pdfIn PDF document text
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/3713409.pdfIn PDF document text
    • https://pulivaxudifosaj.weebly.com/uploads/1/3/4/2/134235984/lozobatapusar_lufutox_vodaruxixaru_berakunitepaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_6051fa49a46d3.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/2281058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/030ee622-b24e-4f3d-938a-1000aa2bd4fe/how_to_know_if_your_princess_diana_beanie_baby_is_worth_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79acd85c-5620-4c2a-91a0-724e867a1428/pumamagekapoledotikip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13600cf2-c567-4a53-88c0-4050164b3600/what_does_excellence_in_education_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630e7966-7385-4068-a45c-0f9a383f0851/microelectronic_circuits_sedra_smith_6th_edition_solution_slader.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_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5872 bytes
SHA-256: 2c9871a0bc353ea64a87a055f057ac8da94493904e0d509f6c6af70027245c4a
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 10596 bytes
SHA-256: eb83836c91b4c7b9f800a29ab968da4a63f4b8d024a3f50c25b23273490c76eb