Malicious PDF — malware analysis report

Static analysis result for SHA-256 af57ca3b9a819591…

MALICIOUS

PDF

80.2 KB Created: 2021-03-16 11:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 92dc07f61b95a3f73f47fe98cd72a8a4 SHA-1: 1ceaaeb09904cc7bd1d6272d34279e253c6cced0 SHA-256: af57ca3b9a819591ad9c91aa353476141f8a96b4d743ab242f4560f9b0f20edc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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.
  • 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.
  • 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://seumenha.ru/wix?keyword=dead+island+survivors+mod+apk+revdl PDF link annotation
    • https://ranetaxute.weebly.com/uploads/1/3/4/8/134886021/1182073.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/the_lost_years_of_jesus_elizabeth_clare_prophet.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/zakikakowo.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/gufipude-soxokexemexoxek-bivafi-munob.pdfIn PDF document text
    • https://jomobezeg.weebly.com/uploads/1/3/4/6/134606819/natalupefuf-mufev-kipikadosopokes-bitisopodageder.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/farmacologia_del_pancreas_endocrino.pdfIn PDF document text
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/nobabuweje_kixibek.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/xewanodasaxexiseki.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/durga_kavach_sanskrit_lyrics_play.pdfIn PDF document text
    • https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/poledak.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/google_maps_florida_city.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/1a9c0ec02.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/zen_budismo_e_psicanlise.pdfIn PDF document text
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/7af20.pdfIn PDF document text
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/b6d110d13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_5725f38ec67140acae17ee2d80cf0ea9.pdf?index=trueIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/damon_brand_archangels_of_magick.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_1e69bb88503c47f5aeaafeab0bbe7360.pdf?index=trueIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/54858819480.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/wemexoxalipepirana.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_0fde176bbe3446978535f0a501eb268a.pdf?index=trueIn PDF document text
    • http://pedamodaw.onlinewebshop.net/joyce_araby_short_story.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_754aabd6d17347d88e5fc6c8e173d1d1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 5028 bytes
SHA-256: 9f39b27885d2ec39ee8f0363e6096721238cf0f247a9f53b1494405d1d36e9a1
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10924 bytes
SHA-256: 42fe577e8abf1cdc2074bcc18009f8302683e7ce9288b37a7cc439b0984a5c2f
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c