Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eafb24875ba2cc…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 09:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1501ebd1b98945b108b7ad712457b0d8 SHA-1: 4ce1ec6ffb26e9692e9baab595b52afe82cdd7be SHA-256: a4eafb24875ba2ccc1f569e8e850725da58a1fb514637e16be4a24dc82c6a1d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDFs hosted on S3 buckets and other domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/123?utm_term=business+plan+template+lean+startup PDF link annotation
    • http://xeboxemovev.66ghz.com/whatsapp_messenger_for_android_2._1.pdfIn PDF document text
    • http://guburifesujera.22web.org/starfrit_mightican_manual_can_opener.pdfIn PDF document text
    • http://nimolebefiv.22web.org/english_french_accounting_dictionary.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/makumapikeze/amazon_sale_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/vezegizovatasisefogobe.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/xitenuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/aparato_reproductor_masculino_informacion_para_nios.pdfIn PDF document text
    • http://zopefunexot.epizy.com/box_culvert_hydraulic_design_spreadsheet.pdfIn PDF document text
    • http://jirarawoxi.rf.gd/fakoxik.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_2323bdb6155a4bd9bf9393b62a37ef1a.pdf?index=trueIn PDF document text
    • http://bubudisefo.rf.gd/zubepesetanesulopon.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/56324073734.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/nabunumifubaxamiwilamevaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/54440435895.pdfIn PDF document text
    • http://dofumuligo.rf.gd/death_by_meeting.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_d1d1dfb25f7a4893ba13032cacf8d104.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_9528340171904c4da5a8c7e6b7502afd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/zeratarozos.pdfIn PDF document text
    • http://lojodufiburu.rf.gd/11878969934.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_3b0ed0395453410aa69e0cf8bbf6621f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/solving_and_graphing_inequalities_worksheet_answer_key.pdfIn PDF document text
    • http://gadudadu.rf.gd/regas.pdfIn PDF document text
    • http://rizoxonepo.rf.gd/diwilinarobipaxozez.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_off0000f088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 5016 bytes
SHA-256: 80eff7690e31fce74250087548f02492dc948e90b91c86ea645c4aed1ce6cafb
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 10780 bytes
SHA-256: 031e3435384ddbd2bdc63ce12aaea1b843b2b9deb10f00b91b1c76fd5d761373

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