Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6a13a2731dd64b…

MALICIOUS

PDF

73.0 KB Created: 2020-10-17 08:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: b13379677bcf69b0edd37b6f2faac84c SHA-1: 6261103f9379a5f4480cd40349352f00819b5e00 SHA-256: 0c6a13a2731dd64ba0f3fcc7db9433df1d27b96f7e3cff987e327cac7b18857c
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=probabilidad+y+estadistica+1+ejercic In PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/zekude.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/6941374.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/lumopuwabuvafikex.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/5461412.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/wabuvavinilexe_tisipojosare_porufibavuga_laxap.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/xulatadetoverudoguz.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/56c58af.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/757d97e5e.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/ffac3ce1-e7c9-4888-ad15-9c3e98bc2f5e/kakusiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5b5540-c939-4f44-a9c5-31215eb81576/nasosebox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452dbcc8-9b8a-470d-93c6-afbca5fdf727/rejifizerinamuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2a6eeb-a97b-4d4c-be84-800fcb9335fa/bexidivezilupugubulupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135dfd15-bd73-4a54-b542-ead77d67ed9f/padoxoviviregewibate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9972/5209/files/demetrios_wedding_gowns_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0244/1124/files/larson_elementary_linear_algebra_7th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7152/0411/files/takarubuzapixuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/nebemap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba5b3b8-b315-4e20-b259-d28c2eef6643/givuzajuritekibaxobut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc5d3b2-9c60-4c54-bae0-41bb8e623d79/24195145040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36238008-f608-405f-aa8f-ef872884c739/autocad_copy_to_clipboard_failed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b8041e-ddf5-4fed-b76f-bc0b4c2784f6/foranorevimepidonikip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b675ca6-e6da-4913-bb47-359caa245a46/firemaking_guide_runescape.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 5304 bytes
SHA-256: 25d464f6b9fadda30e82221b74d0e97ffdd49ef3821b8c172a0206b2e7ad8e6c
font_01_sfnt_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 16972 bytes
SHA-256: b2ec051db7fdabc1378bd8c6924439adff26639bc907dee02814f4a13ea64f40
font_02_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16192 bytes
SHA-256: a173eb1fddcf0d58cd4e9c683673c71cc774c010e0327eda05a6318674e40c89