Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5d163d330c8764…

MALICIOUS

PDF

75.6 KB Created: 2021-04-12 03:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e968063ffe478e011c791326d5f9fc7 SHA-1: 9e0ff9c56ea99c46bfb54f100464105fc76608ed SHA-256: 1b5d163d330c8764aaf3a14ed26c4b4ca9944f0e0db1a34a2407cfb855d0025b
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one specifically linked to a search query about changing a Kindle battery, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous links on disposable hosting points towards a link farm used for redirecting users to malicious sites.

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://zajinet.ru/strik?utm_term=how+to+change+battery+in+kindle+model+d00901 PDF link annotation
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/1609269.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/networking_interview_questions_and_answers_free_download.pdfIn PDF document text
    • http://myimperfectmomlife.com/army_admin_nco_board_questions9kfdc.pdfIn PDF document text
    • https://wujojebexubab.weebly.com/uploads/1/3/1/3/131380870/1183269.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/clases_de_comunicacion_linguistica_oral_y_escrita.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/mokitujimefaxewejuj.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/administracion_financiera_contemporanea_moyer.pdfIn PDF document text
    • http://tryraisins.pro/do_you_roll_again_after_doubles_in_monopolyien9n.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/34625630449.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/planos_aviones_de_papel.pdfIn PDF document text
    • http://acupofjacob.com/nys_dmv_practice_test_for_cdlyk32h.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/jimusaraladusemifug.pdfIn PDF document text
    • http://zuvels.xyz/alto_clef_scale_sheet52k54.pdfIn PDF document text
    • http://republvinb.fun/6140601875jg83t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://familule.epizy.com/nevuzoluwotimixodoxulo.pdfIn PDF document text
    • http://josejutolaxof.rf.gd/86665340046.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/aleluya_wikain_mo.pdfIn PDF document text
    • http://jaweratiz.atwebpages.com/21872629160.pdfIn PDF document text
    • http://jozilaro.atwebpages.com/gonijaxisew.pdfIn PDF document text
    • http://lenixad.epizy.com/relaxation_techniques_for_stress_relief_helpguide.pdfIn PDF document text
    • http://totefopige.atwebpages.com/84244286276.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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5884 bytes
SHA-256: 95120194b0371b2b5bda4759026f45cc8e090aedc9c2ab88504516fddf351d3d
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11104 bytes
SHA-256: ba87deb539266c3bd04f9da44710438c7b944b7a2b3c72f0f1ffd05cd38ad7d7

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