Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa1dd993748dfe2…

MALICIOUS

PDF

84.7 KB Created: 2021-03-24 19:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7fc371db43ca9d7effeaab025af84560 SHA-1: 6b3a21b0f0cd579f471f92652e627ea76238a55f SHA-256: 4aa1dd993748dfe2f3a51f0f5096a2e200131ab545c3bd581d592b00d0fbe1f4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and likely part of a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or malware distribution attempt, masquerading as a document related to Roman numerals for educational purposes.

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://vilenefex.ru/award?keyword=ejercicios+de+numeros+romanos+1+eso+pdf PDF link annotation
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/pobolamewedug_welegupewar_kumarixopaxoma_widoxazozaza.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/vesogevegotuj.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/a9Fhjid/harvard_foosball_air_hockey_pool_table.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/vewekupakivug.pdfIn PDF document text
    • https://tawigijonepoter.weebly.com/uploads/1/3/4/0/134012415/c9a6d2.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/wazurobesowose_komewigol_xafanawebiwo_lidup.pdfIn PDF document text
    • https://belibezininu.weebly.com/uploads/1/3/4/8/134850089/dazakeropin-jobuxifalitu-jawozakiko.pdfIn PDF document text
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/wavub-sexazivisu.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/25670024340.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/EUic3My/vosamutaxunafojukama.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/drivers_impresora_canon_mp250_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/38422227934.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/kirby_heroes_in_another_dimension_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5511693e-2d73-4df6-83e2-4c9cd8bef051/87921788703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc44731-9512-4be3-a2b0-bf04d363c56d/software_application_architecture_diagram_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee43ff4-ac50-47f7-bc69-330d9529b682/xfinity_remote_control_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/zuniwofitizuladigulebenan.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/pharmaceutical_aerosols_ppt_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae6cb35-45e3-42e0-be17-adf07000c15e/what_does_happy_endings_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f13d583-4c36-48b5-8ea5-386e5200f309/56520604045.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/pigamasivulivetupofiwamov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 5156 bytes
SHA-256: 1c275b6d32077744e74a8365b434a1d5602eaa0daa09f1ca4698cc53c5c388d0
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 12508 bytes
SHA-256: 94bc66f772c8c1136264af1fe3e49652a73b28cb70f8f55da9f6af04656d20de
font_02_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2