Malicious PDF — malware analysis report

Static analysis result for SHA-256 a142634360dde839…

MALICIOUS

PDF

75.0 KB Created: 2021-02-25 04:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4f1b36b2a9acc9e18369f8e76b5f2d91 SHA-1: b3da899226bdcf8c1372fc2194700fd4ff8f8c4b SHA-256: a142634360dde839458953c83718e30d0b63ac2c3e40cf9d7bb3be0f95e95801
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/wix?keyword=garden+sun+patio+heater+manual PDF link annotation
    • http://faloken.22web.org/fepokumomululelemopi.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/9dde4870e3d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6026512e8b7dc.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/bpgjWjc/2020.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/joremujuvelumijomada.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/fbL0Dto/26637071667.pdfIn PDF document text
    • http://fobutolojad.iblogger.org/free_business_card_designer_software.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagirisuteladog.rf.gd/how_to_select_instructional_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/terrorblade_build_guide_dota_2.pdfIn PDF document text
    • http://pifutujotot.epizy.com/garilolezemipewof.pdfIn PDF document text
    • http://bumerezuwo.epizy.com/gokunavufagu.pdfIn PDF document text
    • http://vigonodiso.rf.gd/27454744842.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/exemple_attestation_de_travail_maroc.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/gafige.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/fefepafiv.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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 5232 bytes
SHA-256: 9737c1d9e8bc179d0cb86dfce8d618d702ed1c978f20a5691fc656b6e1d72d20
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 11880 bytes
SHA-256: 151007bf92eb0dbdf96db7a2ac6b9bdf29e473422a1d5f42d3532fcb5a98eb3d