Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a674f6a4d12d53…

MALICIOUS

PDF

87.0 KB Created: 2021-04-08 02:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6c3357d06a57859c74e21b2af81bce79 SHA-1: 5bbcb9d4860f3e0f089098896ec7ad2211d3ed08 SHA-256: b2a674f6a4d12d5318911a14d9b43d71c3c47bad42ae749186dca915dcc23687
66 Risk Score

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 likely part of a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to lead the user to a compromised or malicious site. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=the+american+journey+chapter+16+test+answers PDF link annotation
    • http://rubisteq.online/mcelreath_statistical_rethinking384ln.pdfIn PDF document text
    • http://dkmz1.club/hp_elitebook_2740p_ram_specssap8q.pdfIn PDF document text
    • http://gooddevice-online.com/who_invented_citizens_band_radioqw0yt.pdfIn PDF document text
    • http://opensol.xyz/hisense_air_con_remote_instructions9xoev.pdfIn PDF document text
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/buguv.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://edaeda.moscow/vugabegonuziweliwisole03i.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://oneshops.space/gafoxagesuwiwakepakunosegmrksm.pdfIn PDF document text
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/sinowuzebe.pdfIn PDF document text
    • http://presalle.xyz/what_is_osi_model_explain_all_layers9iwee.pdfIn PDF document text
    • http://copyright-notice-ig.com/fanamane9clx7.pdfIn PDF document text
    • http://hookup666.site/duvurufaxubdt2k.pdfIn PDF document text
    • https://desudesukijowa.weebly.com/uploads/1/3/6/0/136033838/7128514.pdfIn PDF document text
    • http://vostokzapad.su/vemevulezonowo1a5bs.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/0559dfaa-7889-4d49-9612-de9cad547deb/65082139491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5aa31a4-0677-4c0a-8c80-e932967290e3/80905414173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d227a6ce-ec19-4087-a933-995542e23669/20658858801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394558ea-5ddf-4262-a5fc-7f6dd86084ff/985533822.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 5568 bytes
SHA-256: 5adacde477159c5159e7296af02e95787544b931dd9f9561f6368fd7f3090f3a
font_02_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 11140 bytes
SHA-256: 97c2a39e72b2c70d3a45e3de68a89930312f19b67e6c9b033526934c02199c48
font_03_sfnt_off000138e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E5 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17

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