Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13cd08a29a14b85…

MALICIOUS

PDF

75.9 KB Created: 2021-03-08 20:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a09e0a208f9d9dddac17bbd68faffa05 SHA-1: 5ab77a5e3acd70148a5d7645caa1bc37dc71b609 SHA-256: c13cd08a29a14b8564afa75ee91796d8b2ea1dabe12b5a37ba24405bd2df18de
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs pointing to potentially malicious or phishing sites. The presence of embedded URLs and the link farm behavior strongly suggest an attempt to redirect users to external resources for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=harmonic+oscillator+quantum+mechanics+pdf PDF link annotation
    • http://copyrightshelpcenter.com/doxuzifezixizewululetuzi6xjd.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/9520956938.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/spoken_english_online_classes_in_chennai.pdfIn PDF document text
    • http://itdiscount.pro/20586698752n14r9.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/1409898.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/how_to_change_battery_on_jbl_flip_3.pdfIn PDF document text
    • http://italdom.fun/angular_4_template_driven_forms_custom_validationobd22.pdfIn PDF document text
    • http://instapriz.site/nipalorepomitowejxuqxh.pdfIn PDF document text
    • https://rorujazikuje.weebly.com/uploads/1/3/1/3/131379225/a31d45675f447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutejaxevewef.myartsonline.com/walmart_brand_center.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/72723161606.pdfIn PDF document text
    • http://zujozidokoj.rf.gd/9928976596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5be14d-8e47-438b-830f-25ec89d2f163/diwapozobi.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/79129093299.pdfIn PDF document text
    • http://mimedixaresev.epizy.com/jupag.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/platform_synonym_dk.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/59309638487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2010bca8-52c2-4ca2-89a0-4935da5aea71/how_much_does_it_cost_to_replace_an_rv_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da053f45-156d-4f7c-896a-b85a05b7b518/sokofokimataka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6067aad1-5f4c-4fca-8d04-ae96135442fc/60139392907.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/govixudof.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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5480 bytes
SHA-256: 6e2ae8c75ced97e669772e543d32e2a97d23762a99e6f98a826bf373ac1d1882
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 10360 bytes
SHA-256: 38b34a19c5064cae0c8f1eaa90490186d9636b215cd21deb40aee18f0379df5d

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