Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5848572099d1667…

MALICIOUS

PDF

77.2 KB Created: 2021-04-05 14:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4d038fac35c25c921c776cb031039130 SHA-1: 11a53cb6209868d7f0cc2c5343cae193dde69f42 SHA-256: a5848572099d1667c7205a1e890a667e852b0fcc321d5ced70fcb4912fcc638a
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical finding for a large number of embedded external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous URLs indicates an attempt to redirect the user to potentially harmful external sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=dracut+police+department+non+emergency+number PDF link annotation
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/tesakazom_gapifugokof_walojaletar_zegunulut.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/hhwhhie/supraventricular_tachycardia_guidelines_2018.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/1958193.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/9082576.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ogUjdFn/mebetekezizatek.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/xofaz.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/1758443.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/rkWibUb/pasosasi.pdfIn PDF document text
    • http://wofirulufe.iblogger.org/64129086131.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/hIjidjg/zewafawid.pdfIn PDF document text
    • https://cdn.sqhk.co/safimowexaw/hiii0ge/73664089988.pdfIn PDF document text
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/8083049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwazez.epizy.com/naleduvorixev.pdfIn PDF document text
    • http://nekeromufuribel.rf.gd/95856050603.pdfIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_af40b7cf2b4a4d80980bc6ce2d74204a.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_bd848dca51cb4179905278b040933d65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/gafepu.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/kitchenaid_superba_dishwasher_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/la_la_land_cafe_melaka.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/3d_shooting_games_mod_apk.pdfIn PDF document text
    • http://satikemapobivix.epizy.com/automobile_engineering_fundamentals.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/kumon_kindergarten_worksheets.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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5456 bytes
SHA-256: 070abc606a91f946befcf60013af9983139c221bf84290f4bf85366897b27604
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 10648 bytes
SHA-256: 30d033704141a7322086a14d30bdd51d3cabecc1eae07619ce3b62d357db80e3

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