Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a899eaa02fbbd1f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 09:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5888559012ce5f5a5a3caaaaedb4e829 SHA-1: 203a65ee52d866feceede31ed596e500283218cd SHA-256: 9a899eaa02fbbd1fac038aa00a74b63b279bfaea71d2513d2f15675ced3ec917
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 0.9997

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://kuzutuzo.ru/award?keyword=valores+de+antigeno+prostatico+especifico+pdf PDF link annotation
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/2843821.pdfIn PDF document text
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/bogor.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxodinumoro/gjIjj82/easy_diy_halloween_costumes_couples.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/0gcjcgi/merge_brawl_for_brawl_stars_hile.pdfIn PDF document text
    • https://wujabadatudipox.weebly.com/uploads/1/3/5/4/135400083/nixutut.pdfIn PDF document text
    • https://cdn.sqhk.co/raxipopu/cjgS6qr/pdf_annotation_free_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/bjfgdFc/carmageddon_2_soundtrack.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/lebip-waridarafep-netasaribi.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/3if8jhl/pizurimurubozaxufokup.pdfIn PDF document text
    • https://cdn.sqhk.co/kajemuwasutu/hckjeS6/zombie_zombie_come_alive_game.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/cbgjhhn/woodwork_tools_for_sale_gauteng.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/6OifhgR/faberizojiperexake.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/a7a9242b-e725-4ec6-b41e-2e0f658e6acf/pezatoxepuforera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5914c141-57d7-4a94-8fa8-fe24ed6a0b42/what_happened_to_american_gods_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/death_of_the_author_barthes.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/tidela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093ee28b-8708-4f2f-9a73-1e005e8030c8/tissot_watch_pr_100_powermatic_80_ladies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9cb899-09c7-4858-b312-ed10735804d7/4602431658.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_e00682ad7d7d46e292b590a44e94d0c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05521f7d-f200-4da5-bdc2-c7872e6e05fe/15702237537.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/sodidubedabegejopumube.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_b3397b862cdb411b92de7a12a287b94f.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_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 5288 bytes
SHA-256: 9c9288e96dcc67552c646f3fc0a53960727329f13e06a62da398a5cc31a4b9e0
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 11436 bytes
SHA-256: eb877a93b4e664009ac37bfdf910822f41f693797de0187376b8f04439459e79