Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ee01a8ecd7382d…

MALICIOUS

PDF

76.9 KB Created: 2021-06-09 12:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 77f0aea3b1417cbbfe90ddaea4c167eb SHA-1: 438fa23c95aa0337fdbcb97335a2b9aac680c7d4 SHA-256: 10ee01a8ecd7382d4ace8afa4e14f991524afe2b2a481e62f6db1210aedf195b
226 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. It uses a password-protected-archive lure. 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 0.9996

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/pbw?utm_term=ielts+reading+academic+test+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411932/normal_60026569d4953.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/7393060.pdfIn PDF document text
    • https://zilibadokaji.weebly.com/uploads/1/3/2/6/132680781/xanevikilabi-baxaxumile.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/lekotafojorepuf-jejofososojum.pdfIn PDF document text
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/zozazatexine.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/sexoditas.pdfIn PDF document text
    • https://felomogolupa.weebly.com/uploads/1/3/4/3/134345494/c42f3.pdfIn PDF document text
    • https://bixivikikem.weebly.com/uploads/1/3/7/5/137504554/mumiloneborini.pdfIn PDF document text
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/e26ac25b.pdfIn PDF document text
    • https://xibijogoxedugo.weebly.com/uploads/1/3/4/6/134662411/difubopo-tutetafabud-wovafegulaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_601797178af08.pdfIn PDF document text
    • https://fufilotaniwa.weebly.com/uploads/1/3/5/3/135321354/pidele-boxuvuvujukakar-votepereriwixud-wobaxikukafava.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/wogigi.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/fc0b0f61caa46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kekirow.pbworks.com/f/how_to_calculate_critical_pressure_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33ad847-8dcd-4fff-8a62-ad58026482e7/38408749869.pdfIn PDF document text
    • http://guvevef.pbworks.com/f/pefetutizovoderelik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00a89a6-d11f-471f-8923-d38d84b7c78a/xubowiwel.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/f/novela_india_una_historia_de_amor_capitulo_2.pdfIn PDF document text
    • http://buluwogot.pbworks.com/w/file/fetch/144841098/dragon_city_hack_gems_99999_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932e1939-f7d4-4afe-b02f-17cfa6c346a4/zajivaberilekujad.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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 5384 bytes
SHA-256: a3b6075d33c9fef118b49dc24d494eb14f3a23ea5897899736eb6ac23305f5b5
font_01_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 10552 bytes
SHA-256: 76f0812d0854e62f7de1856cb91d2de27a596197676d4c03e4a1a7e24ea24a53