Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1aa50f1f192d5d…

MALICIOUS

PDF

81.1 KB Created: 2021-04-02 01:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5e951ce2871904474807fd4100f7732b SHA-1: ed1cf39053b092266eaa987d50e87c7055dd7b8a SHA-256: 6c1aa50f1f192d5d3fb8fb5716fac5256fbbb4ab799f2926e3a7fb47246318bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://dugedepap.ru/wix?keyword=cynthia+izaguirre+husband PDF link annotation
    • http://vibolofisef.mywebcommunity.org/26539358682.pdfIn PDF document text
    • http://zarabotok.space/diminuer_la_taille_des_fichiersnlkxz.pdfIn PDF document text
    • https://buwolipirawelas.weebly.com/uploads/1/3/0/8/130874522/nobibakipexofava.pdfIn PDF document text
    • http://wiwafapudipib.iblogger.org/ada_mp1_clean_settings.pdfIn PDF document text
    • http://uspeh.icu/9137797783k4l8a.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/pejesamewe.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/vewagu.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/bizato.pdfIn PDF document text
    • http://bamejudodenor.iblogger.org/97909460066.pdfIn PDF document text
    • http://cardioactiveufficiale.site/self_reliance_ralph_waldo_emerson_main_idea1xt2w.pdfIn PDF document text
    • http://vobugefu.22web.org/denon_avr_1312_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobaziw/zatobovoboj.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/download_samsung_xpress_m2880fw_printer.pdfIn PDF document text
    • http://xesijapapun.rf.gd/filepumomeromufumiku.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/41335356140.pdfIn PDF document text
    • http://funurebebepoti.epizy.com/interval_data_sheet_aba.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/excelsior_springs_golf_course_tee_times.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/fogler_solution_manual_3rd_edition.pdfIn PDF document text
    • http://sixuvurubemile.rf.gd/budabanirenozukonowezuzuf.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_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 5252 bytes
SHA-256: 72c1bcad891bce908d2fe155d9ed7a37c6bede85125dd4f684fd81d408b77252
font_01_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 12324 bytes
SHA-256: ca19714e95d1ff98ca93a1241fc4756a30f620449d7d1c0c7e0e65df957b7e9a