Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03b748ec6243d99…

MALICIOUS

PDF

52.5 KB Created: 2020-11-09 04:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: df1b24e8c49f3b6b1a3d7a1a7945919b SHA-1: d77cf65c20c0e869efc1a72d82bc777f117c42b2 SHA-256: f03b748ec6243d99f780157dcadbbeafd295927bbb89b6632cea59152433ec1e
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trafffi.ru/123?keyword=khmer+movie+hd+kh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f91974d7b66d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f9a115b9bc9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5f9cc48e66c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f93a6054dad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f88628cd9fb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remuv/blue_fir_trees_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/prache_anti_aging_cream.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/2007_mini_cooper_s_water_pump_tensioner.pdfIn PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/phim_chien_tranh_trung_quoc_long_tieng.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/negaledivo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/navafemejapufolinile.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/lenewot.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49A6 6960 bytes
SHA-256: a88f977de04ddec6eb0eee620d90b4c17243dfd07f7e6b12bc016ed90016fe3c
font_01_sfnt_off00005b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 4740 bytes
SHA-256: 5cc05e2523e97802fb46379c0c3980b91d06a99e58bdda4a5b842ea1dd8c3c64
font_02_sfnt_off00006b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 17148 bytes
SHA-256: a0f36646e64febb1afe7c52c3513e813ad07f2c31d8c0a903e22a2941dbf4e6f
font_03_sfnt_off0000928c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x928C 2396 bytes
SHA-256: 1dbbb51169920b76f0e0482812f5b1b0cc64dc30dba4d0cf642372ba473149fd
font_04_sfnt_off00009d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2D 11628 bytes
SHA-256: 92e847d40ab653229da8f9973d2f1dce4ea14820b058a21b6143475487c0e2f4

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