Malicious PDF — malware analysis report

Static analysis result for SHA-256 121b12d48be5a971…

MALICIOUS

PDF

86.2 KB Created: 2021-03-27 23:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 01c28b2df3a300c47e9022a9a5d4a7cf SHA-1: 2400411877f9c2b4ea217ec9bb156d8e0cb4cb82 SHA-256: 121b12d48be5a9716a7e5c88aec4ee79d9499c06d3a4a9fedd8f74fc706f840c
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. One prominent URL, 'https://resalured.ru/aws?utm_term=formato+contrato+de+arriendo+simple+chile+word', suggests a lure related to contract templates. The ML classifier strongly indicates maliciousness, and the PDF structure with multiple external links is characteristic of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://resalured.ru/aws?utm_term=formato+contrato+de+arriendo+simple+chile+word PDF link annotation
    • http://masajsalonunuz.com/versatile_sew_in_weaveb1s0f.pdfIn PDF document text
    • http://timecodes.net/784740270359rl79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_605b7da85a7b9.pdfIn PDF document text
    • http://xenuven.22web.org/maheshwari_name_ringtone_free.pdfIn PDF document text
    • http://creditscoreusa.info/601589347681q74b.pdfIn PDF document text
    • http://webdefilmizle.com/zozodikatuncjn0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_603bfca64fe51.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/zaxefemebidaz/68303567635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24301ad8-1052-4fb3-86a1-707855718fd8/panasonic_toughbook_cf-53_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/google_chrome_batch_link_er.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e81cb5-b9ed-418f-8526-cdcc0a2f057a/fekawemetofamorodabun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e73007-bed9-4640-a9f2-c01aa2ff2b8b/1806435497.pdfIn PDF document text
    • http://tujulerika.epizy.com/swan_lake_piano_sheet_imslp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e736d806-1c36-4259-b467-91681b56f264/dudevoxeporisurulosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9473f8d-cb44-4422-b52b-5a97c2180dfb/wujovokapikidefapetabirum.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/pajazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e189504c-3d9e-4b49-bfac-2fb109a80037/how_to_read_payne_model_number.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_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 5360 bytes
SHA-256: 066b1dd634940c49d068b9ae9239f632882fce3fdb51cbbd61d43eb97a8852fe
font_01_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 12744 bytes
SHA-256: 47e48c2662ee108f7d52deb64eb91cc61008fc5dfab2f692ec30347bf2f1fe9b

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