Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21d0281c69bf8cc…

MALICIOUS

PDF

89.4 KB Created: 2021-04-26 10:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d81cee9cce44e52942e38a0dfe33a5f9 SHA-1: 13fd8ebfe047a5ca1ff1068d10ceed18a9e01db5 SHA-256: c21d0281c69bf8cc5acc2882f7e24d0831a499b85a7fd861ec73ea0b6b290913
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the overall detection suggest the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://vilenefex.ru/strik?utm_term=leaf+footed+bug+control PDF link annotation
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/1496563.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/gijhT6E/sebum.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/5908255.pdfIn PDF document text
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/5180011.pdfIn PDF document text
    • http://nutigunejome.22web.org/simple_wood_platform_bed_king.pdfIn PDF document text
    • https://zazigiwozaka.weebly.com/uploads/1/3/2/6/132681333/5868341.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/jicgjbz/judun.pdfIn PDF document text
    • http://paselon.getenjoyment.net/cell_cycle_regulation_pogil_answers.pdfIn PDF document text
    • http://garant-ritual.online/vasiwajowapeze484br.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/CF5jahd/ironplanet_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/j5a5TPE/74768413063.pdfIn PDF document text
    • http://f13x.xyz/intimate_matters_a_history_of_sexuality_in_america_third_edition73apc.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/energias_renovables_chile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ef2b9d0e-23f8-419b-a9c9-7b8c206c2702/nagubawek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e760c742-afc9-4b0d-af55-65af9e874c42/how_many_episodes_will_attack_on_titan_season_3_have.pdfIn PDF document text
    • http://rixupod.rf.gd/demevile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84715ed-0d2e-4c4b-a248-7ab4e22b2604/harley_davidson_owners_manual.pdfIn PDF document text
    • http://xovogig.epizy.com/46877457291.pdfIn PDF document text
    • http://kimejuj.rf.gd/fawazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f2f2eb-6c5c-4477-b839-6ab3f0828481/17391260019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad4d706-9dda-4e7f-a7ea-22a431b08036/lomusatilarofirotijitow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 4928 bytes
SHA-256: ab706da777d5dd2adb9e17e6228df6a443c83a9910eeba0d5e14a0491b412093
font_01_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 10092 bytes
SHA-256: a331bac694df5e5466e54f49097513262f9c032d5335c831abef7a4150c13189
font_02_sfnt_off00014a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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