Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc15a65003e0a1d7…

MALICIOUS

PDF

79.0 KB Created: 2021-05-05 19:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9b9f32e8e8e9bf16fa722e240565f5a1 SHA-1: 7f67fd10a2fc26bb24fd39fce7523773e5715be2 SHA-256: fc15a65003e0a1d78f5d6baafc7b146f775fdccdcc65e052df7735e7eba5ac94
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent to redirect users. No scripts were extracted from this sample, but the overall structure and URL distribution suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=what+is+fcc+in+finance PDF link annotation
    • http://bazis-rostov.com/78002539222ubwyp.pdfIn PDF document text
    • http://gta-msk.ru/pexokajefewarezirenilgab.pdfIn PDF document text
    • http://olymp-trade.top/muwefop36xi.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/bullet_raja_tamil_movie_hd173ae.pdfIn PDF document text
    • http://canonsburglake.org/varir8paw7.pdfIn PDF document text
    • http://ridunculus.com/mafurozesakilokak041rd.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/siduvudumifekalitafasame.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/54333200027.pdfIn PDF document text
    • http://thehensleys.org/ielts_plus_3_listening_test_5_answerskqgll.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/91966617969.pdfIn PDF document text
    • http://expressday.online/2066731335143yae.pdfIn PDF document text
    • http://healthyforczechrepublic.site/gitasazebipojo2ppwm.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/mavixu/mcgraw_hill_act_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859ce7ac-7478-4ac0-984e-f2683c419662/ar_15_fixed_stock_to_collapsible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5974054c-cabc-4db5-b5a4-424439b5f8ba/sitiweviv.pdfIn PDF document text
    • http://nudibiwer.epizy.com/adjective_clauses_exercise_with_answers.pdfIn PDF document text
    • http://pisisome.rf.gd/antipsychotic_drugs_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/82474719382.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/best_giant_monster_movies_2020_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf24dce-fb27-4219-b4b8-8fa4dff7b506/easy_sentence_on_monstrous.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e54263-d869-47a5-90a9-3b1d3f4f6f8a/loturulirifila.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/autocad_drawing_to_converter_free_download.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/zowomamedibog.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_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 4852 bytes
SHA-256: 1ab2542dc5deda2cfa249eee7ceb56c364e3be82806fa26c8e394b89a13cdab8
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 11372 bytes
SHA-256: 9cb1ebf35ac27d24dba33799ec4567595a3314afcb467a3ec2601fc1c7a0d69e

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