Malicious PDF — malware analysis report

Static analysis result for SHA-256 103ec0c01a9ca21b…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 00:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2a43c394fe370fd7f517a3ced5edc8a3 SHA-1: 00f4c772d4497d47b632700102c60b8c2daa2261 SHA-256: 103ec0c01a9ca21bbdb2b3adae1c12b7d8b65dad4fea6cd605259ba43d282b6f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to various domains, some of which are likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/award?keyword=the+amityville+horror+a+true+story+pdf PDF link annotation
    • http://classkaod.ru/how_do_u_hack_a_vending_machinefzq4p.pdfIn PDF document text
    • http://copyrightreports.com/201666327076ubib.pdfIn PDF document text
    • https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/9996896.pdfIn PDF document text
    • http://ecoservice-vlad.ru/bukiperedijesokosmbul.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/4081477.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/rapabotuwizem.pdfIn PDF document text
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/selexegovofo_bevawiri_rimikanekep_tozefewigu.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/2020_julian_date_335.pdfIn PDF document text
    • http://cardioactiveufficiale.site/tijotasukixaluzisihjm5.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/76a4532d.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/1308175.pdfIn PDF document text
    • http://matrixbicycles.com/diablo_3_eternal_collection_strategy_guideetsc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_52fd1dcb783c44a1a64270d306f72abd.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_d1ce46b295464b7ebc8d61e41e066844.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bad71cd-4af2-46a1-a603-ab052e38f4fe/67555291544.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_e76da13f8a56405796b295647a2e24bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb29c0be-d953-4cc1-ae8e-4a6de1d9967d/99620550124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49867a7-f74d-473a-9fad-86f2788605ae/92562096358.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_4f696ecafa364ab2a2dd199e19276153.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/635d1c96-df65-4e1e-8b22-49a23c8a021d/87502300161.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/98574399154.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_18cc117ad3d54c7a812981dab71a7fe2.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_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 5392 bytes
SHA-256: ed76fe26b48ec0ff56441c2dfe4777c27ec5644f163af1ccd6a16efbce407a7b
font_01_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 10264 bytes
SHA-256: ec41d2dfb87a8c1f5ae21625d129914c5c15a2ffbb80e23ba353eb6bc4e39283