Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbdaf6b7b000ff7…

MALICIOUS

PDF

76.4 KB Created: 2021-02-18 10:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cdf0b7cf34d66b781a2e544a523e30a9 SHA-1: fb4e0ad1f643c149a50c22788688f445c1e06cba SHA-256: ddbdaf6b7b000ff7c7383c6be25dace6634b8342014c3ab6b65011efb750d36f
74 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs and is flagged by a machine learning classifier as malicious. The presence of a 'download button' heuristic and the structure of the embedded URLs suggest a lure for downloading a payload. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the overall context points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=purevpn+apk+cracked PDF link annotation
    • http://lukanovetefitef.22web.org/99237835143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fe7143d10190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5fd7dd39ab41a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418981/normal_60071e5f32720.pdfIn PDF document text
    • http://shoop-fm.ru/37061132749959qr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5fdae7489b786.pdfIn PDF document text
    • http://rafonuza.22web.org/elite_dangerous_engineers_fsd_upgrade_guide.pdfIn PDF document text
    • http://ximasoj.22web.org/bevywise_iot_simulator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopuviboxew.rf.gd/19459278302.pdfIn PDF document text
    • http://pekoguwomigurup.epizy.com/strength_prediction_of_adhesively-_bonded_joints.pdfIn PDF document text
    • http://wifipuve.epizy.com/bayesian_statistics_the_fun_way_amazon.pdfIn PDF document text
    • http://wekolaxoretewov.epizy.com/mifalosoxetije.pdfIn PDF document text
    • http://batogejupimole.rf.gd/4065212622.pdfIn PDF document text
    • http://mimewimirul.rf.gd/best_version_of_poetic_edda.pdfIn PDF document text
    • http://logoroxesum.epizy.com/expedited_reporting_in_pharmacovigilance_ppt.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 4980 bytes
SHA-256: 49c3ee3322746333e879e6290d65ca97cbe15b5216c803aeb518dfa7e7fc53ba
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10420 bytes
SHA-256: c47fda03251f51e035ac25f04e61a92cbfddaba15e87ce805423468ab6cfa098
font_02_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 16068 bytes
SHA-256: 5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8

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