Malicious PDF — malware analysis report

Static analysis result for SHA-256 062584ca8683ab6a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-06 11:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 590185d26a37aae2378cdc8f2ec68e77 SHA-1: 5e7f3f72bb4b9230e9f77c8fa37b6d051d46f432 SHA-256: 062584ca8683ab6a429313e71f0d227d01bdc1b60c15e297eb64800b3476e5be
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of embedded links suggests an attempt to redirect users to phishing or malware-hosting sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=palm+desert+high+school+calendar+2019 In PDF document text
    • https://cdn.sqhk.co/derilunadine/gwHbetF/piano_tiles_1_magic_tiles_2020_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/ijidWja/ps4_remote_play_windows_8_64_bit_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5fe503c9aa000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5fcc253aa7847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_600e24acb61cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60135a8da3e85.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/33afc0b7-73b7-4f25-93f3-2e7b0b0d28f7/xugesisosa.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_2760c40f6d484ba5a8fbfcea7bede109.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_64ffc70b4ea74ce189da54d43f712b59.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_4db81b3496484b959f62445eb2675fce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/eidetic_reduction.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/libro_microbiologia_veterinaria.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_620ee30d7fde4267864e6f7545c3728f.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_b22ce79987d34ff98e703079e12f7906.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/418360e1-a7f1-42ab-8e85-8ceab8605ca8/ti_84_calculator_free_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/zelatowivanetizewobaz.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_54ae842a02e84ef68f2e67a9de5cac3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5d92c0-e18b-469e-887f-e3b757bd6f08/lego_movie_maker_app_free_download.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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5836 bytes
SHA-256: 8208fbbedec311815a9ce7238ba0f7735f0aa7e8b909e696a71103dcbafdd739
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10332 bytes
SHA-256: adb368e56e870343710d0c54955507335caabe5fab3509f415b5c8325890a781

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