Malicious PDF — malware analysis report

Static analysis result for SHA-256 4542828e3179ef45…

MALICIOUS

PDF

84.6 KB Created: 2021-03-15 08:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e7af547c960172914a2f57b1d4074928 SHA-1: 20d292439c3ddb65151ebb1089fd752ae184e172 SHA-256: 4542828e3179ef450cb754c4a12e5ccd877dee4fd289ecd7a0cddd3055a2870d
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominently featuring a search query about dental studies. This URL, along with others hosted on disposable domains, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=how+long+to+study+to+become+a+dentist PDF link annotation
    • http://rogofede.22web.org/bosch_addressable_fire_alarm_system.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/35689102273.pdfIn PDF document text
    • http://sizuxubotinukor.22web.org/29546231335.pdfIn PDF document text
    • http://xunajoza.22web.org/pefigibovolago.pdfIn PDF document text
    • http://vukuwupevipe.iblogger.org/27875145199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feloxokarapuj.rf.gd/vonowebifovoxejexuximu.pdfIn PDF document text
    • http://danuriluwo.epizy.com/nagomemofarapotuwe.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_d32141fc0148411583591793193ddcb6.pdf?index=trueIn PDF document text
    • http://muziranaxu.rf.gd/classroom_management_plan_sample_seameo.pdfIn PDF document text
    • http://fizaveloxuraje.rf.gd/daniel_boorstin_the_discoverers.pdfIn PDF document text
    • http://kamiwivexa.epizy.com/cooked_skinless_chicken_breast_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/instalar_adobe_flash_player_9_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/pozepa.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_361d520c4b7a4a468f267752ccd8944d.pdf?index=trueIn PDF document text
    • http://dowijasimenazo.epizy.com/36275252434.pdfIn PDF document text
    • http://vigonodiso.rf.gd/38430810299.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/20456986037.pdfIn PDF document text
    • http://tifajolipilel.rf.gd/puwitedomobufibapiz.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_a3f3d09c03e84cbb8e00983e065f6ff0.pdf?index=trueIn PDF document text
    • http://varaxijolos.rf.gd/td_ameritrade_rmd_request_form.pdfIn PDF document text
    • http://kaxasasetepub.epizy.com/75215393361.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_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 5460 bytes
SHA-256: 050936fb4f45351852dfd56c07f3590a5c9d6c539b2df6202637570edeea0f36
font_01_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 11224 bytes
SHA-256: 7c0e93e2a17f3a080646c8f98f075f0c11c8010dfc74465c4e4046b621fbd976

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