Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57828a23624ff66…

MALICIOUS

PDF

37.4 KB Created: 2020-11-07 15:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 79714774a49f836ca51b2a6cd557ebe6 SHA-1: e6fad67d3581b80883699faaf66c3d9d0eebf704 SHA-256: f57828a23624ff6628e3e12dae092fb57ea54abe862df22b83bb410c601aca19
146 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=ucsd+remote+printing PDF link annotation
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/379582.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/jewenoxilod_suwekulupudak.pdfIn PDF document text
    • https://fuzuvetidodevik.weebly.com/uploads/1/3/4/6/134637128/4297638.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/rufuwatemo-gapus-gevopajuderokab-pipojokadudi.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/xizubeneparaxeda.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/5ef07c25ec89c5b.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/nusikegapor.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/25603ada-e225-4ee4-a395-62909c6b2468/painted_desert_sheep_california.pdfIn PDF document text
    • https://gozodusi.files.wordpress.com/2020/11/pipasogasepepudutamigopob.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/noforuvopobaxobigipobim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8ab1b8-7a0f-41fb-a1c9-68ad76c41f2c/eso_vvardenfell_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a9e5ea-64b2-4a4b-b447-be81baa6f84f/tijotuzumalepukoboku.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/radisidi.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.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_off0000539d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x539D 5140 bytes
SHA-256: 473b9733cc09a37cabe17df6fe55a873fb1e38fa03c695a39f682ea4222e7d59
font_01_sfnt_off00006505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6505 10672 bytes
SHA-256: bde9cd2072969f9086ca513009f5a743f386fe9f9a07f885b73f74cb9b7a626b

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