Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88241b9c4a77ff8…

MALICIOUS

PDF

77.5 KB Created: 2021-04-24 15:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 05994a8f0ce01378ce93df779c02e1dc SHA-1: 99863dd5e8078662b494326ae83cc1f8b90a195e SHA-256: d88241b9c4a77ff868d69394a3ef86aa0a8ea59e23607b761b33f9ce4693e4af
156 Risk Score

Malware Insights

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

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 0.9996

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 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://dugedepap.ru/strik?utm_term=santa+clara+unified+school+district+reopening+plan PDF link annotation
    • http://slmit.fun/61832072685ukp08.pdfIn PDF document text
    • http://zhigina.ru/the_secrets_we_keep_book_kate_hewittbr5fk.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/64721975256.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/biomechanics_definition.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/xetasif/79613490854.pdfIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_904dc29783b243bdb969bb99317d3da2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/25136365881.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/vonuwijagupifi.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/biology_textbook_grade_10_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/canvas_shoes_painting_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/bebikerezepavasejaj.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/acknowledgement_letter_for_project.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/12059993895.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/resumen_del_libro_el_principe_de_nicolas_maquiavelo.pdfIn PDF document text
    • http://pigutun.myartsonline.com/fagezekasefuwanurev.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/18787371547.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_0ad91b63b4534a0b907265a33cb2f67c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/xamasobazemufusenodibevi.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/wizuvikewej.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/xumebafefe.pdfIn PDF document text
    • http://vuxepogi.atwebpages.com/xutoxerumotowotixuw.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/battle_trip_ep_62_eng_sub.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 5520 bytes
SHA-256: 03e07afb445570fee777e71d2ce687858533e2b72c7e087b0e84aec33ae79884
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 11004 bytes
SHA-256: 1dd72096007d2fa84f0998bc55e62bdfbc63ef1b62b0f3e8a1ad619500a8aaef

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