Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b73b0ce27f18694…

MALICIOUS

PDF

45.1 KB Created: 2020-11-09 12:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 10c22342533851f361340283d89e5c01 SHA-1: bbef40d1ba64055bdbfbc3591f61344c05afdb20 SHA-256: 3b73b0ce27f186947beb76624f7626fa42c9c9a35ee5ed86fff67926b7b53b69
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

Heuristics 4

  • 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.
  • 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://trafftec.ru/123?keyword=suros+regime+destiny PDF link annotation
    • https://zejuwotozago.weebly.com/uploads/1/3/4/6/134647352/3bedc.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/papolefuji_joweriveloxegub_barelimaniju_tubawarosazajel.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/e62387eb-2d8f-4238-b4e0-b6fa28d08e01/tre_store_sassuolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e63552-de63-435a-874b-b02cc5c9199d/vevavuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa407f68-d259-4ba6-8cc4-1999be81ccfc/vowijowedajefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f3a9e4-bf80-4a83-be94-6fe58892b1d7/sukazikedamopi.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/deductive_reasoning_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2682c2bf-c6e7-4814-a9c6-97a0268a70ad/tufowirodubudarasutuwilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43740f87-2455-41e8-8be0-b75d390c8c6a/saanich_parks_and_recreation_active_living_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c420612-3d20-4786-ae2f-1a1be74f7f31/p_words_4_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/auras_seeing_is_believing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342de7cb-3714-4efc-9fee-10f27238d6c1/lotro_fishing_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d8afa5-5df6-4937-87fb-639828d57e74/55454377412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3686c593-5908-4c5a-8c0c-a26a3197ea5b/nuwobinewusumasogazun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257c04d8-fb2f-4bd8-9787-1f0123dc5c67/naxod.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000675b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 5108 bytes
SHA-256: 0518b24454fd4f74629753a58b57772d37e4e07e991ffd5becea162a2f77b781
font_01_sfnt_off000078a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A4 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00008407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8407 10540 bytes
SHA-256: b3f57015ae4f2f15d2139016fc1e88a67a371344c0ef86d4d30e295320136ed3

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